Here is a video or follow the steps below.
Select "Settings"
Tap "Geofence"
Tap the blue + at the bottom right to Create a geofence
Tap "Create a geofence"
Add name to the Geofence you wish to add
Tap "Next"
You can select to use your personal current locations, the vehicles location or choose any position you like by providing an address
Using current location to allows you to select a shape of geofence you'd like to add.
Tap "Next"
Select if you'd like to be alerted to when the vehicle enters the selected locations, exits it, or both
Tap "next"
Review your choices and if all looks correct, tap "create"
