- Look at the top-right corner of the page.
- Click the word "Profile" found just under the "Search" button.
- At the bottom of the page, find the text box called "Link to off-site Avatar".
- Enter the URL to the image you want to use (I use a photo I have stored on PhotoBucket.com that I use as an avatar on a few different forums).
- Click "Submit"
Just keep in mind, the image has to be less then 80 * 80 pixels and less then 8Kb in size.