Soo.. im new to etterna and my note skins won't work

I put the skin folders i downloaded in the Noteskins folder of etterna, but for some reason they wont appear when i try to change my skin. why is this?

You need to put the skin inside NoteSkins/dance (dance being 4key). Make sure your folder looks more or less like this:

If you have done that, press F2 to reload your noteskins.