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.
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Click Next.
You will be brought to the SJU Google Apps Login boxes. Enter your SJU username and password.
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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
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Tap Save in the upper right corner and your Gmail will be set up.