Thank you for your feedback.
It seems very odd, because the script call vibrateGamepad(time, delay, strength) should cause a vibration normally. For now, you are the first one to describe this problem, so I'm not sure, if I can solve the issue.
As for a tutorial, the text is very detailed and using the plugin does not differ much from other plugins for the RPG Maker. If something in my description is unclear, don't be shy to ask. I will gladly answer your questions as best as I can.
I have also some questions for you to rule out some common errors, which happened to me, too:
1. Did you check, if the plugin is activated?
2. Is your controller capable to vibrate? For example, I have one controller, which cannot vibrate.