I have installed the package NoiseShaders (https://github.com/keijiro/NoiseShader.git) via the package manager in Unity. It shows up as installed in my package manager.
My question is how do I use its functions in my shader? Do I include something, and if so, how do I include something from the package manager to my shader?
Looks like you should include these files in your shader
Then you can call one of these functions:
From what looks like an example shader in the package, here: https://github.com/keijiro/NoiseShader/blob/master/Assets/Visualizer.shader