The instructions below are the same for launching any Kiosk App, such as for the following: ACT, ISASP, ELPA21, Schoology LockDown Browser, etc. 

Steps to using a Kiosk App:
1) Turn on Chromebook
2) Bottom left-hand corner click "Apps"
3) Click "application name"

Steps on exiting a Kiosk App:
1) Hold the Power Button for 1 second
2) Choose "Sign out"

Please note, you will not be signing into the Chromebook, if you sign into the Chromebook then the Kiosk App menu will not be available.