Well, go to the site that you want thats blocked at school. Go to a domain host, ie www.freedomains.co.nr and make a redirect. Your school thing wont even notice, because its a site they probably dont know about.
it works...im an admin at my school, and the school tekkie is a guest. lol, its a fun thing, and they dont lgo admin actions, so your safe.
it didnt work for me where do you save it, and would this be correct "net lockalgroup Administrator zwhitt /ADD" ?