1. Resize you pic in a photo editing program such as Adobe 6.0 to no larger than 100x100 pixles.
2. Upload your pic to the sSnakeSs.com photo hosting space you were given when you signed up (1meg).
3. Go to change your avatar as you would normally and chose "Browse".
4. Find your pic in your gallery and select it.
That "should" do it. Some of my specific directions might be a tad off but that is the jist of it.