Sony PCG-SR33 - Manual (Page 73)

To Install a Memory Module
73
4 Open the display panel, raise the palm rest toward you, turn it over, and then
set it gently on the keyboard. When you turn the palm rest over, gently
perform the action in order to avoid breaking the attached cable.
5 Before you remove the module from its package, touch a metal part of the
notebook to discharge any static electricity accumulated on your body.
Remove the module from its protective package.
6 Install the memory module by holding the module edge connector pointing
down with the notch on the right, and then insert it diagonally into an empty
slot.
Location of Screws
✍
To avoid damaging the notebook, do not remove or loosen any other screws.
Opening the Display Panel
Palm Rest
Palm Rest on Keyboard