Chromecast built-in allows you to wirelessly cast content from your favourite websites and apps to your television, directly from your computer or mobile device.
You can do this by following these instructions:
  1. Connect a mobile device such as a smartphone or tablet to the same network that the television is connected to.
  2. Launch a Chromecast supported app on the mobile device.
  3. Select the (cast) icon in the app.
The screen of the mobile device is displayed on the television. If you are experiencing problems with video casting from mobile device to your television, make sure that Chromecast built-in was enabled during the First Time Installation process.

If you do not wish to reset the TV to repeat First Time Installation, Chromecast built-in can be activated by enabling options [WoW] and [WoL] in menu options: Settings > Network & Internet.
After enabling these 2 options, unplug the set from the mains and plug back in order to make enable these changes.