Sony PCG-SR5K - Manual (Page 75)

Adding Memory $!
3
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.
4
Before you remove the module from its package, touch a metal part of
the computer to discharge any static electricity accumulated on your
body. Remove the module from its protective package.
5
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.
Palm rest
Palm rest on keyboard
Notch
Edge connector