Understanding Curvy Generator

[theKing]

Hi,
I'm trying to use Curvy Generator to create a mesh from a spline, but I really can't figure out how it works since I didn't find any tutorial.
What I did after opened Curvy Generator is:

• Adding a Input Spline Path module
  
• connecting it to a Shape Extrusion Module
  
• connecting it to Volume Mesh module
  
• connecting it to Create Mesh module
  

All connection are successful and after I selected the spline for the Input Spline Path module, its header became green. All other headers remain red though.

This is a screenshot of the situation.
   

What am I missing to generate a mesh and make it a standalone game object?

Thanks