Sign into YouTube on your Android phone, and to YouTube.com/TV on your TV (or any web browser).
Browse to Settings>Pair on the large screen and enter the code you see on your phone.
You are now auto magically connected! Try controlling your computer from miles away too, if the large screen is on.
Once connected, you can browse videos on YouTube queue up videos to watch. YouTube can control play, pause, skip forward and back and even control the sound volume of your TV from your phone.
Here’s additional help if you need it.