How do I use this file? I saved it but now how do I use it in SketchUp. Can somebody please walk me through it. I'm still relatively new to the program and what I am really wanting to do is to create rounded corners like as in a sofa cushion. My search brought me here but still haven't been able to produced what I want in SketchUp without using someone else's components.

Does it have something to do with saving it to putting in the program file and there would be a plugin folder?