Starry sky connection (car)?

Hey I have a question

I wanted to make a starry sky and take the power supply from the front.

I have now added some pictures

This is the connection from the starry sky.

Below are the car connections.

Can you tell me which cable I can use for plus/minus? Can I connect my starry sky to somewhere using the connections on the pictures?

Thank you, it would be best if it only worked when the ignition was on, otherwise I think it wouldn't be a problem if not because I can turn on the starry sky using the remote control

Vehicle is a:

BMW E46 Coupe 330i

2002 model year

Pre-facelift

Thanks in advance 🙂

Lg