You make changes in your profile in the "edit your p2p profile" link in the upper left corner.
I think only admins can delete a profile.
Do you need this profile deleted for some reason?

Jim Minatel
Senior Acquisitions Editor
Wiley Technology Publishing
WROX Press
Blog: http://wroxblog.typepad.com/
Jim's Book of the week: No book this week - Donate to the Red Cross!