From a Home screen, tap Apps > Settings > Accounts.
Tap Add account then tap Google .
Enter the Gmail username then tap Next (located in the lower right).
Enter the email password then tap Next.
Enable any of the following then tap Next:
Enabled when a check mark is present
Backup your phone's apps....
Keep me up to date.
If presented with Set up payment info, tap Remind me later then tap Next.
Payment info can be set up later by navigating: Apps > Play Store from the Home screen, tap a paid app, tap Buy and tap Continue then select a payment method.
If presented configure the preferred synchronization settings (e.g., Sync App Data, Sync Gmail, etc.)