There's nothing in the Bentley manual about removing/installing it. Incidentally, it's called the rear parcel shelf. I've done some forum searching for you, and all I could find was how to do it with a sedan, hopefully it won't be too different with a coupe.
Basically, the rear seat back has to come out. Pry off the rear door edge molding by the c-pillars. Then there are 4 clips that hold the c-pillar panels on to the body. Pop them off to get the panels out. Then 4 clips hold the parcel shelf along the front edge. Pop those off, and just slide the shelf forward and out.
That's a summary of all the threads I've read, hopefully that works out for ya.