Need help wiring in a HY VFD to my machine...!

[12volt]

At a quick glance, there should be a couple of wires going to ACM and 0V, just on the right of the terminal block. You are quite correct - there is something missing!

You have Mach3 on a PC but how is the PC then connected to the rest of the machine? Likely to be either a simple break-out board connected to a PC parallel port, or a motion control board connected via USB or Ethernet. Knowing what that board is, would help a lot.

images of the set up, all hooked into a usb into the board and out again. added some images of the mach3 set up too if that helps.