How to add username css to last post?

[poopman]

Currently, I'm trying to make it so the username css shows up for latest post on forums.
I can't seem to find it though.

 

[poopman]

nvm it's solved, anyway to get the staff display add-on?

 

[BattleKing]

please could you share more details about your request and the solution, it is not 100% clear for us