First, prepare and save a low-resolution .jpg or .gif file of your virtual face or picture on your computer. The maximum dimensions of the file are 85 pixels wide x 85 pixels high. The maximum size is 30 kB.
Next, log in: you'll find the log-in fields near the top right of the page, in the maroon bar just below the gold subject tabs. Log-in fields are unmarked; user name is first, then password.
Once you're signed in, click on "Members Only" in the maroon bar or on "Members" in the small links at the very top of the page. You'll then see your profile at the top of the right column.
Click on "My Account." Then click on the "Edit" tab. Scroll down, past the "Account information" section. In the Picture section, click the "Choose file" button and select your prepared photo file. After you've done this, you will see the name of your photo file to the right of the "Choose file" button. Now scroll down to the bottom of the form and click the "Submit" button to save your changes. Your photo will now show at the top of your account page, as well as in the site's member directory.