In a nutshell, the red bar across the top of each page of this website is your starting point for finding naked places around the world—or at least in parts of the world we have online so far. The downloads option on the purple bar is where you access the files that are viewed in Google Earth.
You can probably figure out how everything works by clicking around. If you need a tutorial on how it all works or a summary of all the symbols and colors, you can find it in this section, which consists of the three options on the orange bar above. (Just don't try to take it all in at once!)