The City list screen allows you to manage a list of cities that you want to monitor. From the Weather application, tap (or press) the Menu Key > Settings > Edit city list.
Tap the Add icon in the upper-right corner of the screen to add another location.
Tap the Delete icon at the top of the screen to delete a city from your list. Checkmark the city, tap Delete, then tap Yes.
Touch and drag the handle icon (on the right side of the screen) to move a city to a new position in your city list. This affects the order viewed when you swipe across the Weather application screen.