Hi,
Those pictures are part of a new feature we are rolling out where users can create User Profiles. This feature is rolling out forum by forum so we can test it out, right now it's out on about 30% of the forums. Once it's in a forum, you'll see on the top left hand nav, above the search bar a link for "My Profile". Click that to edit it. For more info, you can go to:
http://www.medhelp.org/help/my-profile.htm.
Hope this helps and please let us know any feedback.
MedHelp - Harry