hi!
I don’t know of that emulator, but I bet they all work the same. So try and follow the steps in the read me file (that I’m posting hereafter). Be sure to use the CPM files included or the ones you normally use.
Spectrum +3:
Insert the Spectrum CPM Plus disk and then use the machine's LOADER feature.
Once CPM Plus has finished loading, insert the game disk
Now type PLAY GAME
You have to press a key to dismiss the intro screen