In your LIVE site, if you click on the Account Details option under Your Account button available in the top right corner of the page, you would be redirected to your account details page.
In this page, you will be able to view the account information, payment mode, payment information, billing information, shipping information, subscription status and your invoices.
Any changes to your account/billing/shipping information can be done using the Edit option available in the right corner of each section. The card information can also be updated under the Payment Information. Below are the sample images for reference.