To cancel your subscription,
click Account in the left-hand navigation menu to open your account settings
on the Subscription panel, click Cancel
Your subscription will remain active until the displayed billing date.
Note that there may be a closing invoice due (and automatically charged to your card on file on the billing date) if you've added any extra games (over those included or already invoiced) since the last invoice.
When your subscription gets deactivated (on the next billing date), any schedules that have finished will remain public; any schedules that are still active will be made private (invisible to the public).