There’s nothing really to do on the gravatar site. You successfully activated your new image and it’s working. Most of us are seeing it already. It’s just your Web browser or AOL holding on to the old image.
You can do one of two things:
1. Wait and it will eventually catch up.
2. Try to force your browser reload. Try pressing ctrl-F5. If AOL is holding on to the old image (very likely) then you’ll just have to wait for them to update.