Inside swackett for iPhone it's easy to add additional locations to your app.
First, tap the screen to bring up the toolbar. Then, tap on the location name.
Next, tap the Edit Locations button
Then, tap the + button in the bottom left corner.
After that, just type in the Zip Code or City name and select a location from the list.
The next screen allows you to change the settings for your new location. When you are finished, just click Save.
To change a location, follow the first step, and then select a location from the list of available locations.
To Delete a location, follow the first two steps, and in step 3 press the arrow. Then choose the Delete Location button in the location settings screen.
To Make a Location the Default, in the screen above tap on the location to move the checkmark, which denotes it is the default.