The tool works by gripping on the inside of the BB bearing or cup, you will need a screwdriver (or similar) and a hammer, to tap the tool from the opposite side; this will gradually knock the bearing or cup out of the frame.  You can see the 30mm (BB30/PF30) version in our tutorial video here: https://youtu.be/-a4qFSOTGR0; the method is identical for the 29mm and 24mm versions except you will not have circlips/snap rings.

 

Also works with SRAM GXP press fit; you would use the tool to remove the 24mm side, then you are able to easily knock the 22mm side out using a larger drift such as a piece of wood.