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In order to shout, you'll need to login, then find the place that you're currently at. Use the search box in the upper-right part of the site to find that place. As an example, you could enter "Starbucks" for the Person/Place field, and "Portland, OR" in the City, State field. Shizzow will return a list of places that meet your search criteria, and once you find the place that you're currently at you can click "Shout" to declare your location.
I'll take a look at the FAQ and see if I can make the instructions a little more clear. Let me know if you have any more problems...