Delete can be done via Settings> Other Settings> Delete Account.
URLS:
http://www.klikthet.nl
http://www.klikthet.nl/instellingen.html#/settings/xml/tab_settings.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.