Scanning a QR code:
On the iPhone, this can be done with the camera. With Android, you need an app with which you can scan the QR code. You will find a large number of free QR code scanners in the Android store.
The "Add app to screen" function depends on the operating system and browser: With Android, you will be asked whether you want to "Add VAEPLAN app to home screen". If this message does not appear, the browser will show a function for saving next to the input field for the domain (above). On the iPhone (iOS), you must first press Forward (rectangle with arrow pointing upwards), then there is the "Go to home screen" function in the lower menu of the Safari browser (scroll a little to the right!).