Applying a Skin to the controller

Hi All, I Don't know anything about lectora. I am trying to find working on this tool. I am very confused about "Applying a Skin to the controller" in lectora. Can you please tell me what is "Applying a Skin to the controller" in lectora an how can we use "Applying a Skin to the controller" in lectora? Can you Please tell me where is it tool so i can trying to use this tool?

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