Inner Metal Door Skin - Help removing needed

Fallen Angel

Leon Cupra 1.8T 20v 180
I need to get access to the back of my door locking mechanism as a plate has fallen out which lets my barrel slide in and out, i need to get the plate back in place.

How the hell do you take the metal door skin off as it seems the window runners are attached?
If you have pics it would be very helpful
 
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