Login to your account and navigate to account details. In the personal details section you can update your credit card.
You are able to have multiple credit cards saved in your account. Click on ‘Add new card’ to add a new credit card. When you add a new card you can give it a title, for example ‘Personal’, so you can easily identify it in the future. If you have a failed payment, once you have updated your credit card details you can click to retry the payment.