How to configure CSS Registry Editor tool?

To all Techyv Members,
I am not a sophisticated computer user but I want to recognize the configuration setting for css registry editor tool. I recognize the importance of this tool in every computer device nowadays. In a forum I had read that the file is divided into two sections, keys and values. But I really don’t exactly know what it stands for.
I am asking here now the detailed steps on how to exactly configure the settings for css registry editor tool. I had a concern on the correct file syntax. How to enter the correct value of every corresponding key? I am afraid that if I don’t use a registry editor my files will all be erased. What are the exact settings for this css registry editor tool?
I hope that a detailed steps or even a video on how to do this could help me about my concern.
