The ToS is clear: “If you wish to terminate this Agreement or your account (if you have one), you may simply discontinue using the Website.” You know the advice in such cases: anonymise as you please, otherwise you may always still try contacting the site and request deletion.
URLS:
http://www.intuitionhq.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.