If the card used for the initial purchase of your subscription is expiring, being cancelled, or simply does not have sufficient balance remaining for the next renewal payment, you can change the payment method through your online account interface. The account is accessed through the My Account menu item. Your email address functions as the Username and the password is that which you entered during checkout. Once logged in you are directed to your account page and presented with a menu of options on the left side of the screen. Select the Payment Methods option. From there you can Delete previous methods and Add new ones.