Once you have Login , you will see the screen with options to select the Child ID's Name and Selecting the time interval. Choose the Child Name on whose Device your are installing the App. And select the time interval up to your desire , longer time interval will help battery to run longer.
After setting the options , tap the lock button . Now app will start running in background and the settings cannot be changed without password. Now can you exit the screen by clicking the "Exit" button