To add a location follow these steps;
Launch the app and select the menu (three horizontal lines, top-left)
then the pencil icon in the top right to access the edit locations page.
If you need to add a location, press the '+' icon in the top right of the page. Enter a city, ZIP, or postal code to search for a location and then select the location from the results list. Note that you can add a maximum of 12 locations in the app.