Tap the New City icon (at the bottom left corner of the screen) to select another city for your list.
Tap the Delete icon (at the bottom right corner of the screen) to select one or more cities to delete from your list.
Tap the Menu Key (in the Front Touch Keys bar) to delete all of the cities in your World Clock list.
Touch and hold an entry in the list to open a Context menu to select Set daylight saving or Delete.