How can I use code to control the parameters of Lighting/Scene/Fog

Unity Engine
1

When I use the Unity5.0, I want to set the parameters of Fog in Window/Lighting Panel， Where should I put the codes?, thanks！
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2

This is what you’re searching for:

3

I see, Thanks a lot!

4

I wonder if there is any Video Tutorials to show how to use RenderSettings.