1. Open your settings and go to the Accounts & Passwords tab in the left column.
2. Select add account.
3. Choose the exchange option.
4. Type in your email and a description.
5. Press next and choose to sign in.
6. Sign into the page that it redirects you to.
7. When it asks for permission to access your mailboxes select Accept.
8. You can now select what you would like to sync to your device, and you will be finished.