Thanks for replying. I'm a Devils fan btw...
As for NHL 94, I've downloaded the app to DS4Windows programme and it seems my controller is connected (I don't really play PS4 much these days, so I have a spare controller).
The problem I'm having, is when I go to change the settings on the emulator, it's not letting me assign any buttons and just giving me keyboard options. I've watched the instruction video on YouTube and I can see it show instructs you to confirm different buttons but I'm just getting keyboard key options, if I press on them with keyboard it just changes them to a question mark and back.