Long-press the green button on the right-hand side of the screen to turn on the device
If unregistered, you will see a login screen/options menu with a Mason OS version in the bottom-left corner, if below 3.1.0, sign into the form using your Mason controller login and password
If 3.1.0 or greater, follow this video tutorial to register using a QR code.
Have you created a new group and project in the Mason controller?