Wich 8K+ KDMS VIDEO to watch

Lots of Videos but I’m looking for one that talks about how to install my new KDMS that just got here.
or Do I plug each speaker wire into the headset or use the Y cord? I put the strap thew the headpiece.
I have some type of pice that I did not use. What is if for? also looks like little screws in a bag. I took off the black hinges and replaced them with the blue ones that came with my KDMS, Box did not come with an invoice or any type of guide.

This guide section has some info

With the 8k+ I would try each headphone port first as some have earlier on tested Quest 1 headphones. You may end up needing to use the Y cable to connect to left port.