Have you got a computer, and downloaded Mach 3 software. Have you bought a Mach 3 CD.
Mach 3 supports MaxNC machines. If you get Mach3 running on your computer, and then open up Config/Ports and Pins on the first page you will see that the right hand box has places for you to tick - Max NC is one of them.
Tick this, and then close down Mach 3 and open it again.
As far as I understand, if you do this, Mach 3 will be configured to drive Max NC machines - i.e. the Port and Pin numbers will be already allocated. You will need an interface between the computer and your machine.