People have been confused to how to tag members in posts for a bit now, and we've used the excuse that "oh, we'll fix it when we get to the new IPB update".
Well, that's pretty damn lame, because we've had it now for a good long time, and its really easy to do. It's different from the Twitter/Facebook style of just typing '@', but its still pretty easy. You can either just type out the code yourself or just do as the following .gfy shows
That's the code you want.
Make sure you correctly type the person you want to tag's username or it won't work, and you if you messed up the tag you should delete the post and create a new one, as I do not believe it works post-edit.
On mobile you can't click that button thing because its not there, but this really isn't a hard code to remember. just a bracket, member=, the username with a single quotation around it, and then bracket.
Any questions let em fly at me. Pretty easy stuff here that I see people messing up a bit