I added some wiring pics in my thread about the Huanyang VFD parameters, which should help for the VFD side. They don’t show how to connect the PWM signal at the Shapeoko controller end, because it depends on your controller version and setup. The controller map here shows where on the board you can get the PWM signal. The easiest is to use the BitRunner connector on the right side if you have one of those.
The “wiring diagram” between the VFD and GRBL is actually very simple: connect PWM from the controller to VI on the VFD, connect GND from controller to ACM on the VFD, done.
And we’ll be here if you have questions !