Please note that our car radios support Carplay via USB and via Bluetooth. All car radios purchased before March 2022 will probably not have a wireless option. To get Carplay working, all you have to do is connect the USB cable. Try both USB connections if it doesn't work. Only 1 of the 2 USB connections is suitable for Carplay.
Did you buy a car radio after March 2022 and was it mentioned that the car radio has a Wireless Carplay function? Then switch on the WiFi and Bluetooth of your iPhone and connect the iPhone to the car radio via Bluetooth. After linking, you will receive a notification whether you want to allow Carplay, then press Accept. After a few minutes, Carplay will set up and start.
Please note that you sometimes have to enable SIRI via settings to be able to use Carplay wirelessly.