If you no longer need the prayer times for a city, you can easily remove it.
iOS
1. Go to the home page and tap Settings of the city you want to remove.
2. Tap Remove.
Android
1. Go to the home page and tap the name of the city you want to remove.
2. Tap Remove.
Related articles:
Why can't I find a city?
How to add a city?
How to add several cities?
How to change a city?
How to change the default city?