Download the Outlook app to your device and add your C-N Office 365 account. Once you sign in to your account using your C-N email and password, the app should then be synced to your account.
Alternatively, you may also use a different email client. You should be able to sign in to your C-N email in order to sync it to the chosen app. Just be sure to select "Outlook" as the email type (as opposed to Microsoft Exchange).
If using a browser to check email, note the following:
Go to outlook.office365.com
Sign in using your C-N email (i.e. abstudent@cn.edu) and password