Create Infolabel (or modify existing one)

i am stil clueless
Anyone have a hint for me on where to start ?

The "Weather" window has the following property's i would like to set
"Window(Weather).Property(key)"
- Location
- Current.Temperature,
- Current.Humidity

And would be great if i can add a property with
"Window(Weather).Property(key)"
- Current.AirPressure
- Current.Temperature2