The VFD isn't setup for external control if PD01 =0. you need it set to =1

Then you must check the Output for the relay is enabled and set up with the correct pin number. Then in the spindle setup, you select this output for the M3.

When all these are set correctly it will work. If anyone isn't set correctly then it won't work.

For speed control, you will need a breakout board or controller that provides either PWM or analog spindle control. Knowing Merchant dice or Bionica whichever you want to call them this would have been a £500 extra for a £10 board which they didn't fit as standard.

If you can get better pictures of the boards then it should be possible to identify.