First page is the exploded view of the rear seat. About halfway down the 2nd page begin the instructions... and the 3rd page is instructions for removing the cover.
I found it curious that the first thing the instructions say is to remove the backrest cover, and references the instruction page for that. But when you go to the cover instruction page, the first thing it says there is to remove the backrest???
It seems those plastic lock clips are the key.
Anyway... here you go. Good luck! :-)