@mentions enable users to call out other community members and community content within a post. This is helpful for responding to a forum topic when you want to link to another post that includes some helpful information.
Community supports two kinds of @mentions:
With User Mentions, users can call out specific users in their posts and invite them to join the conversation. You might @mention a user when you know they can answer a question or provide valuable insight into a thread. Or, you might just want to make sure they see it when you want to say thank you or give public praise.
Let’s say you want to thank a user (Admirkind) for his great answer to a question you asked. Using the Rich Text editor, enter his user name, preceded by an "at" symbol (@). In this example, you enter “@admirkind”. As you type, a pop-up menu appears with matching names. You can either continue typing the name or select a name from the list.
Note: You must be on the Rich Text tab to add a user mention. You cannot be on the HTML tab.
When you select or finish entering the name, the mentioned user name is highlighted, as shown here: