There are only 2 RAM slots on the board. You have to actually remove the screws from the bottom of the laptop, and then pop the top bezel, palmrest, and keyboard off very slowly. There will be 3 ribbon cables to remove before totally removing this from the rest of the system. You will then need to remove two screws from the system board, 2 screws from the cooling fan, and one screw from the hard drive, and unplug the ribbon cable from the board that goes over the top of the hard drive. You will then, GENTLY, lift the system board up, and you will find the 2 slots underneath the system board.
I just upgraded mine to 16gb, yesterday.