You can update your card on file/via your account page.
Click here to login to your account and follow the instructions below to update your card and/or billing address.
Under MY ACCOUNT DETAILS, select Billing Information, click EDIT:
On the next screen, click EDIT next to the card number:
Enter the card number, expiration date, and CVC as prompted then click OK:
If your billing address needs updated, uncheck Billing address same as shipping address and enter your new shipping information where prompted. Click OK to continue:
A popup window will open confirming your plan frequency has been updated.