Just follow these steps to watch CBS.com content using Chromecast:

1. Install Chrome browser on your computer
2. Open Chrome, and install the Google Cast extension
3. Connect your computer to the same Wi-Fi network as your Chromecast
4. Go to CBS.com, click the cast button shown here User-added image, and watch your favorite CBS shows live and and on demand.

If you do not have Chrome installed, you can download it here.