Follow carefully the steps of the app tutorial.
To be sure of the proper installation, open the settings page clicking on the (menu icon) > (settings icon) > button settings page.
Open the page n°5 of the book and move it in front of the screen in order to see the illustration of the page in your screen.
The calibration image needs to be fully visible, the recognition will appear a green thumb on the screen. If the thumb doesn’t appear, move your book to find the perfect position.
If the problem continue, do not hesitate to contact us at firstname.lastname@example.org