Tap Settings > Accounts > Add account > Email.
Type your full email address and password, and then tap Next.
If the phone cannot find your settings, you need to add them. If you have an Office 365 Exchange email account, in Server, type outlook.office365.com, then add your Username "firstname.lastname@example.org" and Password.
By default, Mail, Contacts, and Calendar information are synchronized. Tap Save.
If you're prompted to create a passcode, tap Continue and type a numeric passcode. If you're prompted and don’t set up a passcode, you can’t view this account on your device. You can also set up a passcode later in your settings.