@ Cowabanga

Hes not asking to fix a bug. He wants to know how he can add a shader to a model.


Thats simple:
Include in your mainscript with #include <mtlfx.c>
Then in the WED open Menu and under map properties select your mainscript. You can right click on a model (i.e. your player) and choose properties. In the propertis window you can now choose the toon shader or another shader that comes with GS.

Just a hint:
download the lite-c workshop. After that you know many more.