When you first open your app, you will see your customised home screen. It will look something like this:
Base of the home page, with information on the sockets, lights etc. This section is always in the app. It allows you to see what is happening by lighting, heating (if in use) and power consumption.
If you want to turn off the system, then you can simply press one button (All lights, off.) Or if you wanted to access a room, then you select that room. More in 'Room working'