To cancel your subscription, follow the 'cancel continuous subscription' link from under Profile & Settings > Subscription.
Apple App Store Payments
If you paid for a subscription via the iPhone app, you'll need to cancel your subscription through the app store.
Please note: You do not need to contact your bank/card provider to cancel future payments. Banks sometimes charge a fine (known as a 'chargeback') and this can sometimes mean that payments are marked as fraudulent. This can result in your Christian Connection account being closed on a permenant basis.