You can’t delete your account.
Check out this (actually quite funny) thread on the subject: http://www.cracked.com/forums/topic/60985/how-do-i-delete-my-account
Try contacting them via http://www.cracked.com/contact-us.html
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.