You can change the payment method listed on your account, or add another payment method, in the Payment Methods section of your account page.
Be sure you are logged into your account. Go to your account page and click the Payment Methods icon.
From here, you can add a new credit card profile.
Platinum Club+ Members please note:
If you change your payment information while you have an active PC+ subscription, you will need to cancel your current membership, and purchase a new membership. Please clear your browsers cache and cookies; then add a new CC profile during the check out process and re-enter your CC information.