If you go to the top of any page, you'll see a button labeled "User CP [control panel]." Click on that button. Then, on the next page, click on the "Edit Options" button. On the following page, go to the bottom where you'll see "Other Options." Under that heading is "Avatars"; and under that is "More info." Click on that link and you'll be taken to the Avatar Home, where an avatar is waiting for you! Now, when you get to 100 posts you can add any avatar you want from any source â€” as long as it fits the size requirements.