On Start, flick left to the App list, tap the Settings icon, and then tap Email + accounts.
Tap Add an account and then choose Google.
Tap the Email address box, and then type your full email address (e.g. firstname.lastname@example.org). Tap the Password box, and then type your email password.
Enter a display name, which is the name that you want displayed on sent emails.
Tap Sign in.