Before you can use your new card, you'll need to remove the old one from your account. To do this, simply:
- Click 'My Account'
- Click 'Manage Saved Cards'
- Click 'Delete' next to the expired card
Once this has been removed, click 'Add New Card', enter the required information and press 'Continue'. Alternatively, select 'Make a Payment', fill in the required information and save your new details by ticking the box at the bottom of the form.