Mach 3 software or another program?

[A_Camera]

I am afraid that unless you find a plugin for Mach3 you will need to do some modification to your machine unless you are willing to start with Planet CNC. Perhaps you will find some people here or on cnczone who are using Planet CNC who can help you with that.

BTW, the link in your other thread shows a box which is not USB. I think it is better because that gives you the flexibility of using any software, even if in some cases you need to buy a separate controller. With a parallel port type of CNC you have the choice of using UCCNC, Linux, Mach or whatever you want, you have also a huge pile of motion controllers to chose from. Complain to the seller that they did not deliver what is on the picture, or did they deliver that USB-parallel cable as the picture shows? Because if they did then you can easily swap that one out with something else, but if the USB controller is inside the box then it will take more efforts from you.