Apple PowerBook (Memory (RAM) Replacement) - Manual (Page 13)

PowerBook (FireWire) Memory (RAM) - 13
4 Pull down on the keyboard release tabs (located to the left of the F1
and F9 keys) and then press down on the top portion of the keyboard.
5 Let go of the keyboard release tabs to secure the keyboard in place.
6 Replace the PowerBook battery or plug in the power adapter.
Warning: Never turn on your computer unless all of its internal and
external parts are in place and it is closed. Operating the computer
when it is open or missing parts can damage your computer or cause
injury.