You can tag users in threads by typing an @ before their username. As you type @ followed by the first letters of the user's name an auto-complete drop down will appear allowing you to select the appropriate user. That is especially helpful if you don't know a particular user's exact spelling. When a user is tagged they will will receive an alert with a link to the thread they've been tagged in. Cool feature Example: @GhostSheets
in the last few forum skins, when we used the @ to tag someone, it would remove the @ once you selected their name. Now, the @ remains and we see @usernamehere, instead of just usernamehere. The old way looked much more clean. I dont know if it's able to be how it was in this new version, but would be cool if you can look into it
Yeah we used to have it working through an addon. Now it's built right into Xenforo so they changed it a bit. I agree it looked better in the past though.