On your iPhone or iPad:
Tap Settings, then go to Mail.
Select Accounts, then "Add Account."
For the Account Type: Select Google
You will be asked to sign into your Google Account. You will enter your SJU email address and include the @sju.edu.
Click Next.
You will be brought to the SJU Google Apps Login boxes. Enter your SJU username and password.
Choose which apps to activate; Mail, Contacts, Calendars. If you wish to only view your Contacts, for example, swipe the switch off for mail and calendars
Tap Save in the upper right corner and your Gmail will be set up.