Please find the below video on how to wirelessly cast to you Microsoft Casting device within your TV. 

Below are basic written instructions on how to do this.

1. Turn on your laptop.
2. Sign into your laptop.
3. Turn on the TV.
4. Press 'Source/Input' on the TV remote and change the display input to HDMI 3.
5. You will now be able to see a 'Microsoft Casting' screen, displaying the name '{TEACHING ROOM}' on the board.
6. Moving back to your laptop, press the Windows+K keys on your keyboard at the same time.
7. This will open a utility box at the bottom right of your screen. Select '{TEACHING ROOM}'.
8. Underneath '{TEACHING ROOM}' on your laptop it will now say 'Connecting'.
9. On the board it will say '{DEVICENAME} is connecting'.
10. Momentarily after, your device will connect to the board and your display will appear.
11. You are now free to use your laptop in duplicate, extend or PC screen only.
12. You are now also free to roam around your classroom and display wirelessly to your board.
13. Once you are complete, press the Windows+K keys again at the same time, then select disconnect.
14. The board will then return to HDMI 3 ready for a new connection. To use a HDMI input, please follow STEP 3, but select HDMI 1.