See also:

Switching on automatically
Select transmission position R with the engine running. The backup camera image is displayed if the system was switched on via the iDrive. ...

Increasing or reducing speed
The speed can be changed in the range from approx. 4 mph/6 km/h to approx. 15 mph/25 km/ h by pressing the accelerator or brake pedal lightly. A target speed within the same range can be spec ...

Releasing
Raise lever slightly, press the button and guide the lever down. ...