From the site (conditions): Notice of termination by a member is made by a request for termination through the Websites. In other words, use the link and send a request for termination containing your data. NB This is how to view paid membership or just your account (free membership).
URLS:
http://www.smulweb.nl
http://www.smulweb.nl/contact.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.