To use it, I open up the tab on my Chrome browser, enable the Chromecast icon on the top right corner, and then maximize the screen. It works reasonably well as long as your WiFi is fast and isn’t too busy.
Some websites, like YouTube have a little icon that you click on to enable video casting. With sites that do not have this feature, as in the examples I mentioned above, you need to cast video from a Chrome tab.
Chromecast is basically a small inexpensive piece of hardware that pugs into an HDMI port on your TV. I don’t see it as a replacement for the Roku 3, which I use most of the time for streaming, but you can actually do a lot with Chromecast, including watching YouTube videos and cast video from Tablo.
Here is the official documentation link.
UPDATE JAN 31, 2017 – If you have a Google Chromecast device, you can now stream CBC on your TV with your Android apps.