Tap the “Settings” icon.
Tap the “Google” link.
Select which options you would like synchronized with your phone, and then tap “SAVE”. Note: You only need to have “Mail” selected here, the rest is optional.
Scroll down and tap the “Accounts & Passwords” link.
: Use the keypad to type in your full email address, and then tap “NEXT”
Press the home button on your iPhone to return to the home screen.
Tap the “Add Account” link.
Use the keypad to type in your email password, and then tap “NEXT”