To get your first 20 minute trip free you need to open your app and go into MENU/WALLET
At the bottom of the page you'll see "Have a promo code? Add it here" - Add BRITE22
This will add €5 credit to your wallet so you can start your trip.
Find your ebike in the app's maps, click to reserve for up to 10 minutes, walk to the bike, press start rental or scan the bike's QR code to start, fly around town then park it at any of the parking zone black boxes in maps.
If you go over the 20 mins your card will be charged for the extra time used @ €0.20 per minute.