Go to the Control Panel (link top right of page). Put the web address of the picture in the "Set external profile image URL" box and click Submit at the bottom of the page. Job done. If you're trying to use an image from your PC using the "Upload profile image" box, don't. Max size is set at something ridiculously low like 20KB. Instead upload your picture to the web, either using your own webspace or to ImageShack ( http://imageshack.us/ ) and copy the URL into the "Set external profile image URL" box instead.