Forbidden: 403 Error. You don't have an index page!
Don't worry, it's not all that scary. Were you expecting to see something else? This server requires you to have an index page in order to see something by default. You'll need to call it "index.html" or "index.php" (and that is case-sensitive). This is how the server knows what to show, because it's not going to show the listing of all of your files and foldersthat would be unsafe (from a web security point of view)!
This doesn't mean your site is broken, or the server is messed up: even if you upload something, if it is not called "index.html" or "index.php" you won't see it (unless you write it out in the URL, like http://a.parsons.edu/~username/somefile.html).
Try it! And remember, it's CaSe-SeNsItIvE!