Testing your webpage with Futureshock is done by replacing the 'www' in your url with 'futureshock'. So http://www.eos.ncsu.edu becomes http://futureshock.eos.ncsu.edu If your url does not begin with a 'www' then 'futureshock' is simply prepended to the url. So http://people.engr.ncsu.edu becomes http://futureshock.people.engr.ncsu.edu
If your site is coded with relative links, then navigating around your site on futureshock should be simple. However, if your site is coded with absolute links, then every link you click will take you back to the normal site. You will have to add 'futureshock' back to the part of the url as indicated above on the pages you want to test. Be sure to check the url you're displaying frequently to confirm that you are still using futureshock.
Also, remember that like webtest, warnings are enabled on futureshock so warnings that would be surpressed on the normal servers are being displayed.