ok, to change your steam ID go into the control pannel ( to get there i usually hit the private messages button at top of screen) then hit edit profile, there are two places to put in steam id, you want to put yours in the second.
Also to find your steam id, when you are in a server type status in the consul, and it will say your name then something like this: STEAM_0:0:12345678
Edit: - I'm sure that's what i said some 3 3/4 hours ago - Raven -
