First you need to navigate to each staff member's settings to enable this feature. Location tracking is off by default to save battery power so it must be enabled manually and have the necessary permissions granted.
Click on "Staff".
Go to an employee's detail by clicking the arrow beside the employee's name.
Click on "Settings".
Swipe on the switch beside "Location Tracking" to turn it on.
Now you will need to follow this guide to make sure your employee's device is optimized for location-tracking.