You mean the 128 MB memory?
Installing is very simple. You gotta flip your MPC over and there are two screws on the left side. Unscrew it and open the cover for the slot. Before for touching the ram make sure to ground yourself by touching something metal to discharge any static electricity.
Insert the memory at a 45˚ angle and push down until you hear a click. Be gentle.
Fire up your MPC and check to see if it reads your ram.