Best to remove the vegetable crisper first, take a look to see where the two small holes are to pop the cover into place. Those holes sit underneath the above shelf. Put the vegetable crisper back in before trying to fit the cover. It was a bit fiddly to do but got it in. Had to be very careful not to break the hinges. I found crossing my arms over and holding the cover into the holes helped as I popped it into place.
Tools Required:
No tools just a bit of jiggling around to sort out.