The first thing you need to do is log into your account page here

If you have an active subscription, there are 2 ways to change the credit card details:
1. Follow the instructions from the FAQ "How to change my payment method".
2. Follow the steps below:
- Select the Payment methods link from the left menu
- Select the 'ADD PAYMENT METHOD' button.
- Add the information from the new credit card and select the 'ADD PAYMENT METHOD' button

If you do not have an active subscription:
- Select the Subscriptions link from the left menu.
- Click on the 'View' button displayed right below the subscription details. In case you have more than one subscriptions, select the specific subscription you wish to change the payment method for and then click on the 'View' button.

- Click the Resubscribe button displayed right below the subscription details. This action will redirect you back to the checkout page where you will basically place a new order and you can fill in any kind of new payment method you wish.