Ok, I've looked through the account options and can't seem to find the option to add an avatar, or signature. I'm sure it's posted somewhere on here, but for the life of me I can't find it...and I'm probably looking right at it.
If you click the "User CP" link near the top left part of the screen(make sure you're logged in), it will take you to a screen with a menu on the left side. "Edit signature" and "Edit avatar" should be under the "Settings and Options" section there.
"The proper rewards are not simply tacked on to the activity for which they are given, but are the activity itself in consummation." -C.S. Lewis
"Whoever loves discipline loves knowledge, but he who hates correction is stupid." -Proverbs 12:1