There is not "insert fuzzy logic" button in WED...

Look for C code examples and apply it to Lite-C when you want to use
fuzzy logic calculations.
Its all basic programming in the end, and not an engine feature.

Some small recent games of mine:
Griefer 4k http://damocles11.byethost9.com/griefer4k.html
Kobold 4k http://damocles11.byethost9.com/kobold.html
Cave 4k http://damocles11.byethost9.com/cave4k.html