its different on different gameservers
try use some editor provided with server files
Edit: ohh my bad... forgot to mention that you must be admin to use such commands for first!
to test try shout something like: !test
do you see gm sign on your head?
im so sory i have never tested these files but there should be some file where u can set up your gms...
Code:
E:\[ExTeam] Titan Tech Server\GameServer\SCF_GMSystem.txt
something like that you need to add your admin or gm or whatsoever name there or else commands wont work
its made to secure server for hacker idiots(more for scriptkiddies)