docs: Add user guide for Remove user from stream.

templates/zerver/help/index.md

@@ -98,7 +98,7 @@ as a “**realm**”.
 * [Change the color of a stream](/help/change-stream-color)
 * Message a stream by email
 * Convert a group PM to a private stream (not implemented)
-* Remove someone from a stream
+* [Remove someone from a stream (admin only)](/help/remove-from-stream)
 * [Delete a stream (admin only)](/help/delete-a-stream)
 
 ## Notifications

templates/zerver/help/remove-from-stream.md

@@ -0,0 +1,37 @@
+# Remove user from stream
+
+As an administrator, Zulip allows you to remove users from streams to
+help manage your Zulip team. You can do this by accessing the
+**subscriptions page**.
+
+### Finding the subscriptions page
+
+There are multiple ways to navigate to the subscriptions page. You can
+either:
+
+1. Click the **cog** (![cog](/static/images/help/cog.png)) icon in the top right corner.
+2. Select the **Manage Streams** option from the dropdown menu.
+
+![settings](/static/images/help/settings-dropdown-streams.png)
+
+or
+
+1. Click the **cog** (![cog](/static/images/help/cog.png)) icon
+   located in the **left sidebar** next to **Streams**
+
+![Streams Cog](/static/images/help/streams-1.png)
+
+### Remove user
+Once on the **subscriptions page**:
+
+1. Select the stream you wish to remove the user from by either
+   searching for its name or finding it in the streams list.
+2. Under **Stream Settings**, scroll down to the **Stream Membership**
+   section.
+3. Finally, find the user you wish to remove in the subscribers list
+   and click **unsubscribe**.
+
+<img src="/static/images/help/stream-settings-unsubscribe.png" alt="Stream Unsubscribe" style="width: 50%;"/>
+
+Congratulations, you're finished! You can now exit the **subscriptions
+page** by clicking the "**X**" in the top right corner of the modal.