STEPS to use Chromecast via Chrome Browser steps:
1. Open your Chrome Browser (or download it HERE) Chrome updates automatically, so you should be all set.
2. At the top right, click More Cast...
3. Choose your Chromecast device where you want to watch the content.
--If you're already using the Chromecast, you'll see the active icon
4. The fun set - Visit Pluto TV in your Chrome browser and cast away!
You can review the Minimum System Requirements here to ensure that your computer and network are capable of supporting this function.