You can change user title here freely http://forum.toribash.com/profile.php?do=editprofile

If you want too pay for it then go too link Assassin provided. I am not sure if they really did get rid of coloring it like that, but i know you are still able too customize user text. For example my "Post Whore" is custom

Edit: and if you meant your user name you cant color your username, only staff have colored user names depending on the role they take part in such as Gm, Marketeer, Sm, etc.