1. First, make sure that the audio system has AM/FM input options, and select the appropriate connection cable according to the connection interface type between the radio and the audio system.

2. Secondly, plug one end of the connecting cable into the audio output interface of the radio and the other end into the corresponding input interface of the audio system to ensure that the plug is firmly connected.

3. Finally, select the correct input source on the sound system to receive audio signals from the connected radio, turn on the radio and sound system, and properly adjust the volume control of the radio and sound system to ensure good sound output.