Bucket's right. You need 50 posts and 7 days on the forum to be allowed to use a custom (i.e., your own uploaded) avatar. This link will explain it all- http://www.icmag.com/modules/Benefits/
Hey Im a little confused with adding your own custom avatar, I havent had one before for this forum, but I cant find how to add your own. I only see the option to add one of the default ones for the forum. Anyone help me out?