Connecting VW Polo 9N 2003 Radio: Wiring, Antenna & Speaker Setup with Limited Knowledge

Hello, I would like to connect the radio to the pole. Immediately I say that my knowledge is negligible. There are 2 wires, one from the antenna and the other one as shown in the picture. There are no new speakers in the door, they are in the pillar by the windshield. And the problem is that I have 3 sockets on the radio and I only have one cable to connect. There are 7 wires to the plug in the picture and when I connect this tip to the radio, only 4 are as if connected and the radio only turns on and looks for the wave. . Is it possible that I do not have wires from the speakers and I will have to run them from the door to the radio and what are the rest of the unused wires in this plug?

Yellow and red is +, brown is ground, white should be the standard ignition switch here, i.e. to turn on the radio, black and red is vol + and vol-, light next to brown is mute, from the steering wheel? It is worth checking the power supply with a meter