If you've forgotten which credit card you used to subscribe, you can find this information on the My Subscription page. Clicking the Update Credit Card button will reveal the last four digits of your card. Then click the X to exit without changing your card. If there is no card number listed, it means that you have removed your card and there isn't one currently associated with your account. This is fine until your plan rolls over, at which time it won't renew without a credit card. If you'd like it to renew automatically, you'll need to add a card before the end of your subscription plan.