The LED on the top of the Home Mini reflects your connection status.
Once you’ve plugged the device in, the light will flash blue, which means that the Home Mini is ready to be set up via the app and is trying to connect to the internet.
Once the Home Mini is connected to WiFi, the light will turn green until it's connected to your meter.
Once your Home Mini has is up and running (ie connected to the internet and your meters), it'll turn white which means you should be able to see your live data and cost within the app.