You can change your card details by logging into your account and clicking the Account Details tab.
From here, click on the header Payment to enter your new card details. If you already have payment details saved, you'll be able to see them displayed on this page.
To update your payment details, click on Change payment method (see left photo). A dropdown box will appear (see right photo), allowing you to enter your new card details - don’t forget to click Update!
If you'd like to update your billing address, click on Edit billing address (see left photo). A dropdown box will appear (see right photo), allowing you to enter your preferred billing address - don’t forget to click Update!
Alternatively, you can select Google Pay or Apple Pay.