When you’ve done uploading your site for the first time, you’ll want to check it to confirm it looks the same as you’re locally stored copy.
Your “host address” is generally the determinant of your URL. If you uploaded your contents to “www.pcmachines.com” or “www2.pcmachines.com”, your URL would most likely be http://www.pcmachines.com/username or http://www.pcmachines.com/~username. If none of these variations work, give your hosting provider a call and ask them how to determine your site’s URL.
If you get a listing of your directory structure instead of having your home page display, most likely you forgot to name your home page as “index.html” (the Internet standard for naming home pages). Another possible variation of a proper home page filename is “home.html”. If none of these variations work, there may be a server misconfiguration error. Contact your hosting provider if you need further assistance at this point.