You just have to log in to the app, select the scooter or bike you want to use among those shown on the map, and click on ‘Reserve’. From that moment you have 15 minutes to get to it and start your ride.
In the case of scooters, when you reach the place where your scooter is parked, you can easily locate it by pressing the “Beep-Beep” button – that will make the horn sound and the indicators will blink.