Does anyone know how to remove the head rest? Tried pushing the release, but it only comes out so far. Don't want to break anything. Thanks

 

On one of the head rest guides per sear (the plastic squares) you'll see a hole that a paper clip (or WD-40 straw in my case ) fits.
You need to insert something in there and push the button to slide the whole headrest out.
Also, tilt the seat forward because it will hit the roof coming out.