Top of the forum where? A little more info would be helpful. If you want the usergroup color to be changed EVERYWHERE on the site then do this...
Go to
Usergroups > Usergroup Manager - Open the usergroup to that you want to change the color of and edit - then look for "Username HTML Markup" in the top box. in the first box to the left put the beginning of your CSS code. It should look something like this:
Code:
<span style="font-weight:bold;color:red;">
And in the second box right next to it put:
Of course you can change the above CSS to go with what you want. That code above will produce a
bold red font.