1. First, you'll need to download Google Wallet from the Google Play Store.
   
2. From the home screen, tap the Google Play icon.
   
3. Tap the Search bar.
   
4. Search Google Wallet.
   
5. Tap Google Wallet.
   
6. Tap INSTALL.
   
7. Tap Accept.
   
8. When the application is finished installing, tap OPEN.
   
9. Enter your Wallet PIN.
   Note: If you don't have a Wallet PIN, you will be asked to create one.
   
10. To edit, remove, or add credit cards, from the Google Wallet home page, tap the Menu icon.
    
11. Tap Cards & accounts.
    
12. To add a new Credit card, tap the "+ icon."