To update your payment information, you can sign into your account here and click on my subscriptions. From this page, click on 'Edit Payment Method' and here you can follow the instructions to add new cards and change your payment method. See below:
If you can't see the 'Edit Payment Method' button, your subscription may be On-Hold due to a missed payment. You can fix this by going to 'Past Orders' and clicking 'Pay' on the failed order. This will take you to our checkout page where you can enter new payment details.