If you would like to cancel your Membership auto-renewal, please log in to your paid account first. Go to 'My Account' in the upper right and hit the 'My Info' tab. Click on 'Membership' and you will be able to 'Edit Auto-Renewal Subscription' here: http://www.jibjab.com/my_account/membership
(If you do not see the link to 'Edit Auto-Renewal Subscription, then you have already successfully shut off your auto-renewal or are on a 3 Month Trial).
If you are a 'free' member then you won't see any auto-renewal option. Also, if your account recently expired, then your auto-renewal is automatically disabled.