Use the link to deactivate your account. Looking at the description, it seems it is a ‘deletion’, not truly a deactivation.
By the way: this site gathers quite some information about you, and will try to link you to all kinds of (commercial) education and job opportunities.
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.