To update the card on file for your subscription, follow the steps below.
First, find the link to your subscription management page. An email containing the link was sent to you after you confirmed your subscription. If you've lost the link, you can request it here.
Next, click Manage Subscription.
Then, click the Update button in the Payment Method row.
Finally, enter all of your card information and click Update Payment Method.
Your card has been updated! All future charges will be made to this card.