Log in to your account, then go to http://www.dotster.com/controlpanel/BillingCentral/AccountRenewal.bml (Account Management > Account Renewal)
Select the third option, “Do not renew my hosting plan”. Your account will not be renewed after the expiration date.
To immediately cancel your account, contact support using the form found here (please log in first): http://www.dotster.com/controlpanel/sconsole
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.