Indy, click on profile (it's located next to the messages and gorups) then you click on, view gallery in the bottom and then it has options and there should be like a little tool bar that you click on and scroll through to see what catogory you want to view. Once you find the one you'd like, you click it and vwa-la! There are the pictures, once you've found one you like click on it (the button is the below the image) then scroll down to the bottom and if you're happy wit your choice hit the 'select avatar' button!
Hopes, this helps!!
-Xavier