How do you Enable Mentions

I keep writing and putting @
But nothing happens. There is no Members Name popping up.

I have Disabled >> Deleted Data >> Re Enable

but no luck getting the Mentions Function to work.

Cant seem to find out why it is not working.

I remember I got an error message the first time because I had Simple Mentions enabled but I disabled that one and deleted data.
But I remember it still had installed.

Right now the only work around was to Re Enable simple mentions and it Enables correctly with no errors and Simple Mentions is working.

So I Am wondering if the Mentions code was never installed. But than again I am not sure because I have also Disabled Followers deleted data and reinstalled and never was able to get the Mentions functions to work.

For now ill use Simple Mentions but would eventually like this one to work since Simple Mentions doesnt work for the Wall Comments