How to change location preferences in My Yahoo Weather app?

The easiest way to add locations to your Yahoo Weather page, is to type the name of the city and state, into the white box at the top that says: "Enter city or zip code". As you type, several selections may become visible. Click on the correct one, for the city you are trying to save. When that city's page comes up, right near the name of the city, is an option to "Save" it. Click to save it, and it will appear on the left sidebar, usually underneath your current location.