George,
If you look at your photo way back at the beginning of this thread that shows the VFD connections.
STF - Forward This connects to Port1-Pin14
STR - Reverse This connects to Port1-Pin16
Those relays will turn the VFD on/off and allow you to go forward and reverse.
The speed is controlled by connecting
Port2-Pin1 to VFD pin#2 that takes an analog voltage.
You also need to connect the analog ground on the VFD pin#5 to the analog ground right next to Port2-Pin1 which provides the reference.
After you have all of this connected, and even if the VFD is powered down, you can test the relays.
This is actually recommended.
Now once you have the wires in place and the VFD unplugged from the wall. Issue the following command
M3 S6000
When you do this you should hear one of the relays click, if you can't hear it click you have something configured wrong in Mach3/Mach4
M4 S6000
When you do this command you should also hear a relay click.
M5
This should turn off the relays and you will probably hear that as well with a light click.
After you know the relays are clicking you are ready for the next step.
You will need to modify a few parameters in your VFD before it can be controlled remotely. Have you done that before. If you provide the name of your VFD and the exact model or provide a link to the manual for your VFD and I can tell you which parameters need to change. You need to be careful when changing parameters in the VFD. Setting the wrong parameters in a VFD can damage the VFD or spindle so only touch the parameters needed.
Russ