Enable IMAP in your Gmail settings.
On your phone, press < Home >, then open the Email application.
On the 'Your accounts' page, select Next to get started with setup.
Enter your full Gmail address and password, then select Next.
On the next screen, you can give the account a nickname and choose the name to display on your outgoing messages. Tap Done.
And you're done. You can verify your settings from the Inbox view by tapping < Menu > > Account settings.
Incoming settings
IMAP server: imap.gmail.com
Port: 993
Security type: SSL (always)
Outgoing settings
SMTP server: smtp.gmail.com
Port: 465
Security type: SSL (always)