From the Start section click on ACTIVATE CARPOOLING
Indicate whether you are a Driver or a Passenger.

If you are a Driver you can add a passenger by clicking on ADD PASSENGER. Your passenger should scan the QR code which will be created on your smartphone.

If you are a Passenger, click ACTIVATE CARPOOLING and scan the QR code given by the driver.

The journey will automatically be in carpooling mode. To end the journey click STOP.