How to delete your About.com account

We could only find options to edit our profile (at membership.about.com), but no way to delete it. If you know how, help us out!
URLS:
http://www.about.com

Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.