This tour is kind of silly, because most of the information in it is obvious. But I think it is a good way to show new users around a site.
Use the back and forward buttons to navigate through the tour. When you are done reading and observing, you can use them to move on.
This window explains and comments on everything that you see in the main window. This is not a long tour, but it may give you a better understanding of how to use this site.