This is the home page of the whole site. How do you know that? First, the file is index.htm, which is the "default file" to load when browser requests it. Second, the file is located in the "root" / main folder of the whole web site.
Once the whole web site is transferred to a hosting server (such as homepages.wmich.edu), you can access your home page by typing either http://www.myhost.com or http://www.myhost.com/index.htm (assuming that www.myhost.com hosts your web site).
In your homepages account, the home pages in your account can be accessed by typing http://homepages.wmich.edu/~XXX , where XXX is your bronco ID. For example, if your bronco ID is jdoe, then your home page is http://homepages.wmich.edu/~jdoe