To add an avatar, click on the link at the top for your "User CP" (Control Panel) and then on the left side, click "Edit Avatar"
That should let you upload or link to an avatar.
Wander around, check the site out. Most of us don't bite...so just try it out. Any specific questions, ask here (or send a Private Message to a moderator or administrator).
Welcome to the site man...enjoy it, it's full of knowledge and great people. I have to admit, not a Pats fan, but that's a nifty piece of memoribilia in your avatar. The whole team sign that? What year team? Oh yeah...like the truck too.
Welcome to the site, Fordman5! john112deere is right, the more you wander around, the more you'll figure out. Let any of us know if you have any questions!