Hi,
it's not to bad. Its a three step procoess.
The first step is to associate your on-screen LED with an output with the drop down list, you've picked output#30. See the pic....one of the properties of a Mach4 LED is to be
assigned to an output.
Next step is to open the ESS plugin configurator and find a spare output pin, in this case I chose port 1, pin 14 as its spare on my desktop PC. Note I've given it an alias.
Last step is to associate the output, in this case output#30, with that pin.
Now port1 pin14 of the ESS will reflect the status of your onscreen LED.
Craig