Let's just quickly check that you've got the right device. This article is related to Google Chromecast with Google TV only. Please check the link below to ensure you're using the right device.
Chromecast with Google TV
Got the right one? Cool! Let's get started. Grab your remote control and click on the "Assistant" button
Type or Say: "CloudFit TV"
A page should appear with CloudFit TV.
Well done!! You’ve installed CloudFit TV on your Google Chromecast with Google TV!! Using your remote, click on the CloudFit TV icon.
You should see the following screen which displays a “Pairing Code” similar to the image below.
Next, you'll take this code and enter it on your phone in the CloudFit app to pair your display. You will need to repeat this process on each Google TV with Chromecast that needs to be paired.