How to edit the name of a location to a custom name?

Here is how to edit the name of a location to a custom name:

• Tap 'Edit' in the top left of the main app.
• Swipe left slightly on the item you want to change until the Edit icon appears (don't swipe too far or you'll delete the item).
• Tap the Edit icon and type what you like in the box where the city name currently shows.
• Tap 'OK' once you've finished to save.