If you lift up the seat bench, there is a nut kind of thing there (might be 2) then if you look in the boot, there is one connecting it there as well I think.
To make it eaiser you can take out the back part of the bench.
Then to get off the card pry it off from the rear to the front making sure you have unhooked all the pins.
Hard to explain as I haven't done it in a while and have forgotten where all the fixed points are.