This looks similar to the older models. If so, the RAM should be able to be installed without moving the keyboard. There should be a panel at the bottom on either side of where the two screws have been taken out. It has 3 screws. Underneath should be a RAM slot, though it is one. If you are lucky to have another RAM slot which you imply you have, then you need to remove another screw under this panel. I have seen smaller versions of these that have a screw underneath the RAM so you may need to take it out to see the screw.
This information may be totally irrelevant to your laptop as I have not had a chance to see3 it but I do know that they are similar. However, I am sure that if there is something holding it down, there must be a screw underneath a panel.
Hope the information is of some use
Kash, August 2009