Translation:
"The device was turned on, and I know the positive and negative power wire connections, as well as the speaker outputs. However, the speaker isn't producing any sound. I've connected all the other wires to the car radio's audio source, but there's still no sound. Could someone please explain how to operate it completely? I would be very grateful."
Yikes, more than a few kids' meals dumped on that thing under a seat somewhere.
I can't tell from the pictures what is what. Is there a light that is coming on?
Do you know that the power and signal are actually getting to the amp?
Does the source require some sort of load to actually send a signal to the amp?
In other words, you may need load resistors for the head unit to think it's connected and send a signal to the amp.
Without knowing the rest of the system, hard to gauge what the issue might be. Given all the muck I see around the terminals, I'd start there, clean that thing up, it's filthy!