help: Update subscribe instructions and use them on subscribe users page.

help/include/subscribe-user-to-channel.md

@@ -10,10 +10,17 @@
 
 {!select-channel-view-subscribers.md!}
 
-1. Under **Add subscribers**, enter the user's name or email address.
+1. Under **Add subscribers**, enter the user's name or email address. To
+   subscribe users in bulk, you can copy members from an existing channel or
+   [user group](/help/user-groups). The typeahead will only include users who
+   aren't already subscribed to the channel.
+
+1. Configure **Send notification message to newly subscribed users** as desired.
 
 1. Click **Add**.
 
+{!channel-menu-subscribers-tab-tip.md!}
+
 {tab|via-user-profile}
 
 {!right-sidebar-view-profile.md!}
@@ -25,6 +32,32 @@
 
 1. Click the **Subscribe** button.
 
+{tab|via-compose-box}
+
+1. Start a message in the channel you want to subscribe someone to, in a
+   [new](/help/introduction-to-topics#how-to-start-a-new-topic) or
+   [existing](/help/replying-to-messages) conversation.
+
+1. [Mention](/help/mention-a-user-or-group#from-the-compose-box) the user you
+   want to subscribe.
+
+1. Click the **Subscribe them** button on the banner that appears above the
+   compose box.
+
+!!! tip ""
+
+      You don't have to send the message you started composing.
+
+{tab|mobile}
+
+Access this feature by following the web app instructions in your
+mobile device browser.
+
+Implementation of this feature in the mobile app is tracked [on
+GitHub](https://github.com/zulip/zulip-flutter/issues/1222). If
+you're interested in this feature, please react to the issue's
+description with 👍.
+
 {end_tabs}
 
 {!automated-dm-channel-subscription.md!}

help/subscribe-users-to-a-channel.md

@@ -7,83 +7,7 @@ configure who can
 [subscribe](/help/configure-who-can-invite-to-channels#configure-who-can-subscribe-anyone-to-a-specific-channel)
 anyone to a particular channel.
 
-You will only see the options below if you have the required permissions.
+{!subscribe-user-to-channel.md!}
-
-## Subscribe users to a channel
-
-{start_tabs}
-
-{tab|desktop-web}
-
-{relative|channel|all}
-
-1. Select a channel.
-
-{!select-channel-view-subscribers.md!}
-
-1. Under **Add subscribers**, enter a name or email address. The typeahead
-   will only include users who aren't already subscribed to the channel.
-
-1. Configure **Send notification message to newly subscribed users** as desired.
-
-1. Click **Add**.
-
-!!! tip ""
-
-      To subscribe users in bulk, you can copy members from an
-      existing channel or [user group](/help/user-groups).
-
-{tab|mobile}
-
-Access this feature by following the web app instructions in your
-mobile device browser.
-
-Implementation of this feature in the mobile app is tracked [on
-GitHub](https://github.com/zulip/zulip-flutter/issues/1222). If
-you're interested in this feature, please react to the issue's
-description with 👍.
-
-{end_tabs}
-
-{!automated-dm-channel-subscription.md!}
-
-## Alternate methods to subscribe users to a channel
-
-### Via channel settings
-
-{start_tabs}
-
-{tab|desktop-web}
-
-{!channel-actions.md!}
-
-1. Click **Channel settings**.
-
-{!select-channel-view-subscribers.md!}
-
-1. Under **Add subscribers**, enter a name or email address. The typeahead
-   will only include users who aren't already subscribed to the channel.
-
-1. Configure **Send notification message to newly subscribed users** as desired.
-
-1. Click **Add**.
-
-{end_tabs}
-
-### Via mentioning a user in the compose box
-
-When you [mention a user](/help/mention-a-user-or-group) while composing
-a message in the web or desktop app, an alert banner appears above the
-compose box if they are not subscribed to the channel.
-
-Click the **Subscribe them** button on the banner to subscribe the user to
-the channel. You will not see the button if you don't have permission to
-subscribe the user.
-
-!!! tip ""
-
-      You do not have to send the message you are composing for
-      the user to be subscribed this way.
 
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