The workflow is simple - you must:

1) Add S.H.I.T to your asset library (by choosing the downloaded folder with the .blend file as a file path)

2) Drag and drop the generator you want from your asset library

3) Modify the controls for the look you want

And that's it!

NOTE: 95% of the generators are geo-nodes based, as for the Background elements, these are procedural shaders (and can be modified in the shader editor)