Ok,
AVATAR: Go to Profile --> Forum Profile Information --> Personalized Pic
You can either choose from the library we have or download your own pic.
SIG: Find your picture, right-click it, then click on Properties. You will then see Link Properties and Image Properties. Copy the URL from the Image Properties, then return here. Go to Forum Profile Information, then scroll down to Signature. Paste the URL into the box, then surround the link with image tags ((IMG)(/IMG), except replace the "()" with "[]").