How to add EasyRain Splash or Puddle to my Material

Hi there, I am trying to add an EasyRain (by Willliam Faucher) material function to my materials. In his tutorial, he uses Quixel Megascan materials as an example, and it seems relatively straightforward. In my instance, the material I want to add the material function to is quite different. Does anyone have a solution as to what I could do?

This is my material:

This is his example for editing Quixel materials