6) Use it!
Get ready to shed some light with your new LED! Click on the switch widget to turn the LED on. The switch will wait for Device Cloud to hear back from the XBee Zigbee that its output state has changed, and then become available again. Click the switch again to douse the light. You just made a physical output that you can operate from the next room, across town or across an ocean!
If you like LEDs there are many out there to try. Also, this simple circuit is the starting point for controlling everything from motors to monkeys. To turn on and off something that runs on a higher current, try making a relay circuit.