1. Open the Google Wallet application, make sure you have logged in to your Google account and are connected to the Internet.

2. Click the menu icon (three horizontal lines) in the upper right corner of the screen, and then select "Settings".

3. Select "Credit and Debit Card" in the "Payment Information" drop-down list.

4. All bank accounts bound to Google Wallet will be displayed. Select the one that needs to be unbound, and a page for editing information will appear.

5. There is a "Delete" option at the bottom of the edit information page. Click it directly to unbind.