Check the ACP page for the plugin. You should be able to enable group mentions there.
Thanks, @baris! I knew there was something I was overlooking and forgot @mentions were actually a plugin.
Hello... My user is one of the first to register on my forum (we have 2.6k now) and mine is to only one that the profile last posts and chat doesn't work.
Does anyone have the same issue in the past? How you solve it?
Its getting annoying... (i remember i tried to delete the user and create a new one logging in with facebook.... but it got the details of the old one.. so... everthing is fucked )