you mean the carpeted piece with the holes in it for you speakers right??? its like cardboard so ya gotta be very gentle. but i slipped mine out from the plastic pieces on both sides its shoved under and pulled it out. just be gentle when wiggling it back under the plastic pieces.
PS DO NOT listen to anyone if they tell you to use some crazy long extension to get the bolts for the speaker tray out.... i listened to one of the "thinkers" here and was on my back in my trunk for like 20 minutes till i realized to do it from the top