Install the Outlook for iOS app from the App Store and then open it.
If it's your first time using Outlook for iOS, you'll be asked to enter your full email address. Enter your full email address then tap the Add Account.
If you are already using the Outlook for iOS
Tap the photo/initial icon (top left)
Tap Settings
Tap Add Account
Add Email Account.- Enter your account password and tap the 'Tick' icon in the top right corner.