How to apply .skin file in DotNetNuke project

I am new to DotNetNuke. My question is how to apply the skin file to the control of the page.

I have the Test.Skin file, I know how to apply that in .NET, but no开发者_JAVA百科t familiar with the DotNetNuke standard. And Also Where to Locate or Put this Test.Skin File in DotNetNuke Project

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DotNetNuke skinning does not use the .skin file process. DotNetNuke skins are created using HTML/CSS and are found in the various /portals/_default/skins folder.