diff --git a/app/assets/javascripts/discourse/app/components/fullname-input.gjs b/app/assets/javascripts/discourse/app/components/fullname-input.gjs
index 471c1e14294..7251eb95ad2 100644
--- a/app/assets/javascripts/discourse/app/components/fullname-input.gjs
+++ b/app/assets/javascripts/discourse/app/components/fullname-input.gjs
@@ -1,16 +1,26 @@
 import Component from "@glimmer/component";
 import { on } from "@ember/modifier";
+import { service } from "@ember/service";
 import InputTip from "discourse/components/input-tip";
 import TextField from "discourse/components/text-field";
 import valueEntered from "discourse/helpers/value-entered";
 
 export default class SidebarEditNavigationMenuTagsModal extends Component {
+  @service siteSettings;
+
   get showFullname() {
     return (
       this.siteSettings.full_name_required || this.siteSettings.enable_names
     );
   }
 
+  get showFullnameInstructions() {
+    return (
+      this.siteSettings.signup_form_full_name_instructions &&
+      !this.args.nameValidation.reason
+    );
+  }
+
   <template>
     <div ...attributes>
       <TextField
@@ -27,7 +37,13 @@ export default class SidebarEditNavigationMenuTagsModal extends Component {
         {{@nameTitle}}
       </label>
 
-      <InputTip @validation={{@nameValidation}} id="fullname-validation" />
+      {{#if this.showFullnameInstructions}}
+        <span class="more-info" id="fullname-validation-more-info">
+          {{this.siteSettings.signup_form_full_name_instructions}}
+        </span>
+      {{else}}
+        <InputTip @validation={{@nameValidation}} id="fullname-validation" />
+      {{/if}}
     </div>
   </template>
 }
diff --git a/app/assets/javascripts/discourse/app/components/modal/create-account.hbs b/app/assets/javascripts/discourse/app/components/modal/create-account.hbs
index 1e45eb1bf86..9a2b85478e8 100644
--- a/app/assets/javascripts/discourse/app/components/modal/create-account.hbs
+++ b/app/assets/javascripts/discourse/app/components/modal/create-account.hbs
@@ -55,19 +55,14 @@
             <label class="alt-placeholder" for="new-account-email">
               {{i18n "user.email.title"}}
             </label>
-            {{#if
-              (or
-                this.emailValidation.ok
-                (and this.emailValidationVisible this.emailValidation.reason)
-              )
-            }}
+            {{#if this.showEmailValidation}}
               <InputTip
                 @validation={{this.emailValidation}}
                 id="account-email-validation"
               />
             {{else}}
               <span class="more-info" id="account-email-validation-more-info">
-                {{i18n "user.email.instructions"}}
+                {{this.emailInstructions}}
               </span>
             {{/if}}
           </div>
@@ -89,10 +84,17 @@
               {{i18n "user.username.title"}}
             </label>
 
-            <InputTip
-              @validation={{this.usernameValidation}}
-              id="username-validation"
-            />
+            {{#if this.showUsernameInstructions}}
+              <span class="more-info" id="username-validation-more-info">
+                {{this.siteSettings.signup_form_username_instructions}}
+              </span>
+
+            {{else}}
+              <InputTip
+                @validation={{this.usernameValidation}}
+                id="username-validation"
+              />
+            {{/if}}
           </div>
 
           {{#if this.fullnameRequired}}
@@ -120,7 +122,7 @@
           <div class="input-group create-account__password">
             {{#if this.passwordRequired}}
               <PasswordField
-                {{on "focusout" this.showPasswordValidation}}
+                {{on "focusout" this.togglePasswordValidation}}
                 {{on "focusin" this.scrollInputIntoView}}
                 @value={{this.accountPassword}}
                 @capsLockOn={{this.capsLockOn}}
@@ -137,19 +139,15 @@
 
               <div class="create-account__password-info">
                 <div class="create-account__password-tip-validation">
-                  {{#if
-                    (or
-                      this.passwordValidation.ok
-                      (and
-                        this.passwordValidationVisible
-                        this.passwordValidation.reason
-                      )
-                    )
-                  }}
+                  {{#if this.showPasswordValidation}}
                     <InputTip
                       @validation={{this.passwordValidation}}
                       id="password-validation"
                     />
+                  {{else if this.passwordInstructions}}
+                    <span class="more-info" id="password-validation-more-info">
+                      {{this.passwordInstructions}}
+                    </span>
                   {{/if}}
                   <div
                     class={{concat-class
diff --git a/app/assets/javascripts/discourse/app/components/modal/create-account.js b/app/assets/javascripts/discourse/app/components/modal/create-account.js
index 965bfb669ea..05e6e299bc9 100644
--- a/app/assets/javascripts/discourse/app/components/modal/create-account.js
+++ b/app/assets/javascripts/discourse/app/components/modal/create-account.js
@@ -142,6 +142,58 @@ export default class CreateAccount extends Component.extend(
     return this.siteSettings.full_name_required;
   }
 
+  @discourseComputed(
+    "emailValidation.ok",
+    "emailValidation.reason",
+    "emailValidationVisible"
+  )
+  showEmailValidation(
+    emailValidationOk,
+    emailValidationReason,
+    emailValidationVisible
+  ) {
+    return (
+      emailValidationOk || (emailValidationReason && emailValidationVisible)
+    );
+  }
+
+  @discourseComputed
+  emailInstructions() {
+    return (
+      this.siteSettings.signup_form_email_instructions ||
+      i18n("user.email.instructions")
+    );
+  }
+
+  @discourseComputed(
+    "passwordValidation.ok",
+    "passwordValidation.reason",
+    "passwordValidationVisible"
+  )
+  showPasswordValidation(
+    passwordValidationOk,
+    passwordValidationReason,
+    passwordValidationVisible
+  ) {
+    return (
+      passwordValidationOk ||
+      (passwordValidationReason && passwordValidationVisible)
+    );
+  }
+
+  @discourseComputed
+  passwordInstructions() {
+    return this.siteSettings.signup_form_password_instructions;
+  }
+
+  @discourseComputed("usernameValidation.reason")
+  showUsernameInstructions(usernameValidationReason) {
+    return (
+      this.siteSettings.signup_form_username_instructions &&
+      !usernameValidationReason
+    );
+  }
+
   @discourseComputed("model.authOptions.auth_provider")
   passwordRequired(authProvider) {
     return isEmpty(authProvider);
@@ -221,7 +273,7 @@ export default class CreateAccount extends Component.extend(
   }
 
   @action
-  showPasswordValidation() {
+  togglePasswordValidation() {
     this.set(
       "passwordValidationVisible",
       Boolean(this.passwordValidation.reason)
diff --git a/app/assets/javascripts/discourse/app/controllers/signup.js b/app/assets/javascripts/discourse/app/controllers/signup.js
index 944fcefc8ff..e5c6d43cbae 100644
--- a/app/assets/javascripts/discourse/app/controllers/signup.js
+++ b/app/assets/javascripts/discourse/app/controllers/signup.js
@@ -125,6 +125,58 @@ export default class SignupPageController extends Controller.extend(
     return this.siteSettings.full_name_required;
   }
 
+  @discourseComputed(
+    "emailValidation.ok",
+    "emailValidation.reason",
+    "emailValidationVisible"
+  )
+  showEmailValidation(
+    emailValidationOk,
+    emailValidationReason,
+    emailValidationVisible
+  ) {
+    return (
+      emailValidationOk || (emailValidationReason && emailValidationVisible)
+    );
+  }
+
+  @discourseComputed
+  emailInstructions() {
+    return (
+      this.siteSettings.signup_form_email_instructions ||
+      i18n("user.email.instructions")
+    );
+  }
+
+  @discourseComputed(
+    "passwordValidation.ok",
+    "passwordValidation.reason",
+    "passwordValidationVisible"
+  )
+  showPasswordValidation(
+    passwordValidationOk,
+    passwordValidationReason,
+    passwordValidationVisible
+  ) {
+    return (
+      passwordValidationOk ||
+      (passwordValidationReason && passwordValidationVisible)
+    );
+  }
+
+  @discourseComputed
+  passwordInstructions() {
+    return this.siteSettings.signup_form_password_instructions;
+  }
+
+  @discourseComputed("usernameValidation.reason")
+  showUsernameInstructions(usernameValidationReason) {
+    return (
+      this.siteSettings.signup_form_username_instructions &&
+      !usernameValidationReason
+    );
+  }
+
   @discourseComputed("authOptions.auth_provider")
   passwordRequired(authProvider) {
     return isEmpty(authProvider);
@@ -204,7 +256,7 @@ export default class SignupPageController extends Controller.extend(
   }
 
   @action
-  showPasswordValidation() {
+  togglePasswordValidation() {
     if (this.passwordValidation.reason) {
       this.set("passwordValidationVisible", true);
     } else {
diff --git a/app/assets/javascripts/discourse/app/templates/signup.hbs b/app/assets/javascripts/discourse/app/templates/signup.hbs
index 7700fcb9a48..51f56cdf993 100644
--- a/app/assets/javascripts/discourse/app/templates/signup.hbs
+++ b/app/assets/javascripts/discourse/app/templates/signup.hbs
@@ -51,19 +51,14 @@
             <label class="alt-placeholder" for="new-account-email">
               {{i18n "user.email.title"}}
             </label>
-            {{#if
-              (or
-                this.emailValidation.ok
-                (and this.emailValidationVisible this.emailValidation.reason)
-              )
-            }}
+            {{#if this.showEmailValidation}}
               <InputTip
                 @validation={{this.emailValidation}}
                 id="account-email-validation"
               />
             {{else}}
               <span class="more-info" id="account-email-validation-more-info">
-                {{i18n "user.email.instructions"}}
+                {{this.emailInstructions}}
               </span>
             {{/if}}
           </div>
@@ -85,10 +80,17 @@
               {{i18n "user.username.title"}}
             </label>
 
-            <InputTip
-              @validation={{this.usernameValidation}}
-              id="username-validation"
-            />
+            {{#if this.showUsernameInstructions}}
+              <span class="more-info" id="username-validation-more-info">
+                {{this.siteSettings.signup_form_username_instructions}}
+              </span>
+
+            {{else}}
+              <InputTip
+                @validation={{this.usernameValidation}}
+                id="username-validation"
+              />
+            {{/if}}
           </div>
 
           {{#if this.fullnameRequired}}
@@ -116,7 +118,7 @@
           <div class="input-group create-account__password">
             {{#if this.passwordRequired}}
               <PasswordField
-                {{on "focusout" this.showPasswordValidation}}
+                {{on "focusout" this.togglePasswordValidation}}
                 {{on "focusin" this.scrollInputIntoView}}
                 @value={{this.accountPassword}}
                 @capsLockOn={{this.capsLockOn}}
@@ -133,19 +135,15 @@
 
               <div class="create-account__password-info">
                 <div class="create-account__password-tip-validation">
-                  {{#if
-                    (or
-                      this.passwordValidation.ok
-                      (and
-                        this.passwordValidationVisible
-                        this.passwordValidation.reason
-                      )
-                    )
-                  }}
+                  {{#if this.showPasswordValidation}}
                     <InputTip
                       @validation={{this.passwordValidation}}
                       id="password-validation"
                     />
+                  {{else if this.passwordInstructions}}
+                    <span class="more-info" id="password-validation-more-info">
+                      {{this.passwordInstructions}}
+                    </span>
                   {{/if}}
                   <div
                     class={{concat-class
diff --git a/app/assets/javascripts/discourse/tests/acceptance/create-account-test.js b/app/assets/javascripts/discourse/tests/acceptance/create-account-test.js
index f24b1007df9..8faa3d5b707 100644
--- a/app/assets/javascripts/discourse/tests/acceptance/create-account-test.js
+++ b/app/assets/javascripts/discourse/tests/acceptance/create-account-test.js
@@ -66,6 +66,36 @@ acceptance("Create Account", function () {
       .hasText(i18n("user.username.required"), "shows signup error");
   });
 
+  test("custom instructions", async function (assert) {
+    this.siteSettings.signup_form_email_instructions = "email";
+    this.siteSettings.signup_form_username_instructions = "username";
+    this.siteSettings.signup_form_password_instructions = "password";
+    this.siteSettings.signup_form_full_name_instructions = "fullname";
+
+    await visit("/");
+    await click("header .sign-up-button");
+
+    assert.dom("#account-email-validation-more-info").hasText("email");
+    assert.dom("#username-validation-more-info").hasText("username");
+    assert.dom("#password-validation-more-info").hasText("password");
+    assert.dom("#fullname-validation-more-info").hasText("fullname");
+
+    await fillIn("#new-account-email", "z@z.co");
+    await fillIn("#new-account-password", "supersecurepassword");
+
+    await click(".d-modal__footer .btn-primary");
+
+    assert
+      .dom("#username-validation")
+      .hasText(i18n("user.username.required"), "shows signup error");
+
+    // only shows the instructions if the validation is not visible
+    assert.dom("#account-email-validation-more-info").doesNotExist();
+    assert.dom("#username-validation-more-info").doesNotExist();
+    assert.dom("#password-validation-more-info").doesNotExist();
+    assert.dom("#fullname-validation-more-info").exists();
+  });
+
   test("can sign in using a third-party auth", async function (assert) {
     sinon.stub(LoginMethod, "buildPostForm").callsFake((url) => {
       assert.step("buildPostForm");
diff --git a/app/assets/stylesheets/common/base/login-signup-page.scss b/app/assets/stylesheets/common/base/login-signup-page.scss
index 177f5dcaa10..7cae704c50f 100644
--- a/app/assets/stylesheets/common/base/login-signup-page.scss
+++ b/app/assets/stylesheets/common/base/login-signup-page.scss
@@ -248,6 +248,9 @@ body.signup-page {
   .create-account__password-info {
     display: flex;
     justify-content: space-between;
+    .create-account__password-tip-validation {
+      display: flex;
+    }
   }
 
   .inline-spinner {
diff --git a/app/assets/stylesheets/common/modal/login-modal.scss b/app/assets/stylesheets/common/modal/login-modal.scss
index 6351dc98bdc..ae455800426 100644
--- a/app/assets/stylesheets/common/modal/login-modal.scss
+++ b/app/assets/stylesheets/common/modal/login-modal.scss
@@ -242,6 +242,9 @@
   .create-account__password-info {
     display: flex;
     justify-content: space-between;
+    .create-account__password-tip-validation {
+      display: flex;
+    }
   }
 }
 
diff --git a/config/locales/server.en.yml b/config/locales/server.en.yml
index d0e0f4d8846..278e1bba42c 100644
--- a/config/locales/server.en.yml
+++ b/config/locales/server.en.yml
@@ -1885,6 +1885,10 @@ en:
     persistent_sessions: "Users will remain logged in when the web browser is closed"
     maximum_session_age: "User will remain logged in for n hours since last visit"
     full_page_login: "Show the login and signup forms in a full page (when unchecked, users will see the forms in a modal). "
+    signup_form_email_instructions: Email instructions to show on the signup form (overrides the default field description).
+    signup_form_username_instructions: Username instructions to show on the signup form.
+    signup_form_full_name_instructions: Full name instructions to show on the signup form.
+    signup_form_password_instructions: Password instructions to show on the signup form.
     ga_version: "Version of Google Universal Analytics to use: v3 (analytics.js), v4 (gtag)"
     ga_universal_tracking_code: "Google Universal Analytics tracking code ID, eg: UA-12345678-9; see <a href='https://google.com/analytics' target='_blank'>https://google.com/analytics</a>"
     ga_universal_domain_name: "Google Universal Analytics domain name, eg: mysite.com; see <a href='https://google.com/analytics' target='_blank'>https://google.com/analytics</a>"
diff --git a/config/site_settings.yml b/config/site_settings.yml
index da1a2545243..6f00a34b811 100644
--- a/config/site_settings.yml
+++ b/config/site_settings.yml
@@ -631,6 +631,18 @@ login:
   full_page_login:
     default: false
     client: true
+  signup_form_email_instructions:
+    client: true
+    default: ""
+  signup_form_username_instructions:
+    client: true
+    default: ""
+  signup_form_full_name_instructions:
+    client: true
+    default: ""
+  signup_form_password_instructions:
+    client: true
+    default: ""
 
 users:
   min_username_length: