Shader Rules is a material in the VSS control prop, not a button.

Select the VSS control prop in the material room and go to the Shader Rules material. You select the material in the material room using the material pulldown. Of the control prop.

Current actor must be the VSS control prop. Current material must be "Shader Rules".

That is where you add rules. Rules for the shaders go in the Shader Rules material. You make the rules using the Designer buttons to add a rule node or add a copy node.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)