You have to Google for "free http proxy", some of the lists you get as a result classify geographically the proxies, find one of those and then choose a US located proxy.
Afterwards set your browser to use as HTTP proxy your selected proxy (what are the steps to do this depends on the browser you use). Some proxies work better than others and some just don't plain work with some big traffic sites, so you might have to try a few (unless you get a trusted proxy from a friend or company.)
Beware that all your received and submitted data could be stored and even modified in transit by a malicious proxy, you cannot trust at all the data received, or that the other party has received the data as you have sent it.
For this reason I'm reluctant to recommend a particular server or list of servers, just use the search term in Google and see for yourself which one you'd trust.
For HULU, I don't think that trust would be much of a problem, but if you forget to disable the proxy and then navigate to your bank disaster might ensue... so be warned.
Aditionally, you will almost certainly be breaking the site terms and possibly some laws (I'm not a lawyer).