Make sure you are logged in, then use the direct link to close your account. Enter your password and a reason as to why you are leaving.
Note, your data will not really be removed, it will be archived, and you can reopen your account any time, hence the grey listing here.
URLS:
http://gopetition.com
http://www.gopetition.com/accountclosure.php
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.