Greetings! Welcome to Tezzaworld website, unfortunately you are a few years late to the show as nearly everyone has been and gone, there is still lots of useful archived material to read through, not many active users unfortunately, but that’s the way it goes, hopefully you are not too disappointed...
take off your 2 rear head rests,
take off the 2 panels at either side of the rear window, be careful clips a bit weak,
the the shelf will be able to come up and you will have access to the cover over the light..