The most frequent reason why the app fails is the limitation of the built-in API key for OpenWeatherMap API. This key belongs to the free account of the developer and allows only 60 requests per minute. This is not enough to cover needs of all users. However, it's enough for a single user.

So, you need to take you own free OpenWeatherMap API key and ask the app to use it.

1. Go to openweathermap.org, sign in and take the API key.
2. Enter you API key into "API Key" setting on the main screen of the app.
3. The weather is going to be updated successfully after some minutes.

You should configure the skin, not the core application.

• Open the settings screen (available from the Launcher)
• Scroll down to the end of the screen, you'll see the list of installed skins
• Tap on the skin name to open it's settings screen
• Choose Celsius or Fahrenheit