Full screen shaders work on the output of the whole screen "Full screen shaders" They will not work on individual objects.
But the first thing you need to do is close FPSC and go to the
program files\the game creators\fps creator folder, open the setup.ini file in a text editor like notepad and make sure of a couple of settings.
Specifically these two:
newblossershaders=1
postprocessing=1
This instructs the engine to use the higher shaders that bond one made for TGC.
Now there are different setting for the postprocessing= entry. But just try the 1 first.
Like I said each shader has a specific function and requires different things. As for most simple full screen shaders go, Just making sure that the settings in the setup.ini file are correct is a good start.