Ok, so when you want to get an avatar, it cant be any bigger than 80x80px or you cant use it, here is a simple way to shrink your avatar ;)
. Go to where the picture is that you want as your avatar, right click it, and save it to your computer.
. Go to: http://www.resizemypicture.com
. Click "browse"
. Select the picture you want as your avatar
. click "more options"
. Click "specify your own height and width"
. Type in "80" in the width and the height box.
. Resize it.
. Right click on your new picture and save it to your computer, you can now add the image as your new avatar!
have fun =P