To sign up for Google Wallet, you must first register an account at Google Account. Once you've registered, browse to Wallet.Google.com, sign in with your Google Account user name and password and fill in your billing information. Finally, click "Accept and Create" to complete registration.
Besides going to Wallet.Google.com to register an account, you also have the option to register an account via the Wallet Google app. This app, which is only available to users in the United States, can be downloaded from either the Google Play Store or the Apple App Store, and is compatible with mobile devices running either Android 2.3 and up or iOS 6 and up.
The steps to register and set up an account are fairly simple. First, sign in with your Google Account. Next, enter your ZIP code and email preferences. You are then asked to read and agree to Google Wallet's terms of service. Once you agree, create an easy-to-remember, four-digit PIN number. This number is very important, as you need to enter it whenever you access the Wallet app or use a Wallet Card (a debit card issued by Google Wallet) to purchase goods online or withdraw money from any bank, ATM or other service that accepts MasterCard® Debit.