So, since it has been broken for so long, I'll describe how this used to work.
Long ago, you could mention a user by typing @ and then starting to type their name, which would cause a little drop down of matching user to select from to mention. It was nice, it worked well.
Enjin updated ... something ... I don't remember what, and that functionality broke. I was told, I think almost a year ago at this point, that it would be fixed, but it still doesn't work and I'm super annoyed with the very convoluted and time-consuming way (especially since Enjin has never fixed the lag on their sites, making loading pages take a while) you still have to mention users.
When will this be fixed so we can more easily communicate with each other?
EDIT: I dug through my old posts, I last complained about this October 2017. So it's been a year. It happened when we were forced to change from the old BBCode editor to the new one, because of the text doubling bug, which probably has also not been fixed.....