in the boot in the door compartment you have a toolkit, in there you have a metal stick, with like a handle, this is so that you can push the screwdrivers handle on to.
you them remove the rear head sets, and infront of the bar, you will see a cut out of metal where the stick goes it. With the handel facing the front of the car, gently push down and this will push the bars in!!
Let me know if you need help.