Sony PCG-XG29 - Manual (Page 117)

Adding Memory #
4
Lift the two stoppers at the bottom of the keyboard and slide the
keyboard toward the LCD display, then lift it away slightly.
5
Lift the keyboard from the LCD display side by releasing the four
tabs, then gently lean it over the display. Be careful not to detach the
cable when lifting the keyboard.
6
Remove the new memory module from its packaging.
stopper
Tabs
Cable