Here's how you can add a Google account in the Google Play application on Android. 1. Open the Google Play app. 2. Go to the Settings menu. 3. Tap on Accounts. 4. Tap on Add Account. 5. Enter the user name and password for your Google account. You can now use your additional Google account in the Google Play app.
For more, see the original article at the link below.
How to add multiple accounts | Droid Life