Select the city you are starting from, as well as an original salary.  Then select a new city.  Each city can be chosen from the drop down lists or by typing in a full or partial zip code, or city and state name.  Clicking the calculate button will produce a result in the list on the right.  You may change only the second city, and calculate additional results.  Clicking on a city name in the results list will take you to the report for that city.  Changing the first city will result in a new list being created.