Q&A Profile page - how to modify and link to?

The profile page looks like this:
Name
Member for
Website

How do I add options? What file should I edit to manage the display (like show a variable assigned at registration, or calculate an experience level based on total number of points) ?

Also, what are some options for dynamically generating the logged-in user's profile page link? I.e., http://evolove.pl/questions/user/dev3/ under menu option "My Profile" for when dev3 is logged in.