Nail System for Genesis 3 Help

defectedsaint

I can use the preset shaders just fine but when trying to make custom settings I have no idea what to do and the included help PDF isn't really helpful. I don't really get the distinction between the "nail system" and the "top coat" choices. I mean I understand what it's trying to tell me to do but no matter what I do the new color overides the old color. For example, I want to use red opaque as the base/nail system with black opaque as the top coat and pair that with the opaque marble design. I start off by selecting red opaque then I turn on the top coat system and select black opaque, but this overides the red opaque choice. Finally I choose the marble design but it never comes out right as the red opaque is always overwritten. I've tried changing the top coat color in the shader prefrences but that doesn't work either. What exactly should I be doing?