Once you are logged in, the first step is to access your account information by clicking on the ‘Settings’ link at the top of the screen:
This will take you though to the following page where you can select the settings you wish to change. In this case, you should select: ‘Account Information’.
Once on this page, you can confirm the credit card details you have in the system by referencing the type of card (eg. Visa) and the last 4 digits of that card (e.g. 4242).
If you wish to update these details, you can do so by simply clicking the ‘Change Credit Card’ button. This will take you through to the following screen where you can simply enter in your new credit card details and save them by clicking the ‘Change Card’ button.