First, if it isn't already installed, you want to install the GMail app from the App store (iOS) or Google Play (Andorid). Be sure to get the app put out by Google itself

Once installed, open the Gmail app and tap Sign in. 

On the Add account screen, tap Google, then tap Continue.

On the Sign in screen, enter your Amherst email address and tap Next.

You'll next see the Amherst login screen. Enter your username and password and tap Login.

If you're the only person using this iPad, you can select Save Password.

Satisfy the Duo prompt. Allow Notifications. Unless you use them, tap Not Now on the chat and meet screen. You're now in your Amherst email.