From a Home screen, navigate: Apps icon > Settings > Users & accounts.
Tap Add account.
Enter the Gmail address then tap NEXT (lower-right).
Enter the password then tap NEXT.
If presented, configure the following as desired then tap NEXT:
Enabled when a check mark is present.
Back up data to your device's apps, app data, settings and Wi-Fi passwords
Keep me up to date with news and offers from Google Play
If presented with Set up payment info, select any of the following then tap CONTINUE:
Add credit or debit card
Use Verizon Wireless billing
If applicable, complete all remaining steps to set up payment info.