1. Find the audio control button or menu on the center panel of the car. There is usually an audio icon or corresponding logo.
2. Tap or select the audio control button to enter the audio setting screen.
3. In the audio Settings screen, you should be able to find the option to turn off the radio or stop playing. This may be marked " Power" A surname; Off" A surname; Stop" Such words.
4. Click the appropriate option to turn off the radio.
Please note that the specific steps may vary for different models and on-board systems. If you cannot find the option to turn off the radio, it is recommended to consult your vehicle's owner's manual or contact Mercedes-Benz official Customer Support for detailed instructions.