Steps to unbind a credit card on Amazon:

1. First log in to your Amazon account. Find the "Hello, Your Account" option in the upper right corner of the page, hover the mouse over it, and a drop-down menu will appear. Select "My Account."

2. Secondly, on the "My Account" page, find the "Payment Options" section and click the "Manage Payment Methods" link under "Payment Options".

3. On the "Manage Payment Methods" page, find the credit card you want to unbind and click the "Edit" button under the credit card.

4. Finally, in the pop-up dialog box, select "Delete this payment method", and then click the "Save" button.