While we’ll be sad to see you go, we still make it easy for you to cancel. Just go into your Account and click “Manage Subscription/Billing,” then scroll down and click “Cancel Subscription” on the following page.
Please note that canceling your subscription only stops the subscription going forward (meaning there won't be any future renewals). It will not, however, affect any boxes that have already been paid for; those will still be good to go!