To update your credit card:

1. Log in to your account
2. Click "Your account" at the top right
3. Click "Credit Card" in the "Account" section
4. Click the "Edit" button
5. Enter your updated information
6. Click the "Next" button
1. To use an existing address, click the "Select this address" button below the address you'd like to use
2. To add a new address, click the "Add a new address" button and complete the form