To get an avatar, you first have log in. On the top of your
screen, click "Profile", then "Edit Options." Scroll down to
the bottom where it says "other options." There should be
a button there that reads "Change avatar" or something
like it. From there you can pick out whatever avatar you
want. But be warned, there's almost 200 pages to go
through and I myself still haven't gone through most of them.