TestNav on Chromebook laptop computers is accessible from the main login window. (Do NOT sign into the Chromebook.) When accessed it launches into a locked down version of the application in KIOSK mode.
Exiting kiosk mode requires the Chromebook to be powered off and then back on.
Login Screen can be one of two options:
In the lower left hand corner of the screen BEFORE anyone has logged into the device.
TestNav in kiosk mode: