There's a section regarding it in the rules, http://www.gamesas.com/index.php?/topic/724862-forum-rules-and-general-information/page__view__findpost__p__10470844
Also topics about warnings, how to get rid of them, why you have them, etc. are not permitted on the forums. Things that deal with warnings and user accounts should be dealt with by contacting a Moderator or Administrator.
9. Posting about moderator or administrator action or inaction is also against the rules of this forum.
Please feel free however to contact the moderator involved, another moderator you feel comfortable with, our community manager Gstaff or another admin if you disagree with a moderator action. Our moderators do not mind taking a second look or discussing an action with the other moderators and admin to assure they have acted fairly. So if you think you've been treated wrongly or that unfairly, be sure to send a PM. Sometimes moderators make mistakes.
I'm sure that if you contact a Moderator or Administrator they can help you with it and explain the process of how to get it removed. The simplest thing to do is just not get in trouble and not cause any commotion on the forum. Even if you don't think you'll get warned for something it's best to refrain from doing it to keep up your public image.