How do I turn on/off Chromecast?

First, ensure that your Chromecast has been set up to cast from the app. Get more info about this here. 

To cast from an iPhone or iPad:

1. When the video is playing, tap the Chromecast icon in the upper right hand corner.
2. Select the device to which you would like to cast.
3. The app will begin casting.

To stop casting from an iPhone or iPad:

1. While the show is playing, tap the Chromecast icon. 
2. Select Disconnect to end the cast.