How to Set a Clan Tag in Counter-Strike: Source
1.) In-Game click Options.
2.) Click Options, then click on the Multiplayer tab, then the Advanced button.
http://files.fileb.ag/i/00000/mmpxci9civ2q.jpg
3.) From the drop down, select the clan you'd like to make your default.
http://files.fileb.ag/i/00000/p7z1fxibror3.jpg
4.) Hit OK, and Apply.
DONE !!
