You can cancel your subscription by contacting support: http://www.dilbertfiles.com/contact/?support
From their FAQ: You will have to include the email address you used to sign-up with and indicate that you would like to cancel your account. We will ensure that your subscription will not be automatically renewed after the current subscription period ends.
URLS:
http://dilbertfiles.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.