To use Rumble on Chromecast with a TV code, follow these steps: First, open the Rumble app on your phone or tablet. Then, on your TV, open Chromecast and navigate to the Rumble app. You will see a pairing code on the screen. On your mobile device, visit rumble.com/pair in a browser. Enter the TV code displayed on your screen to link your device. Once connected, you can stream Rumble videos directly to your TV. Enjoy your favorite content by controlling it through your phone while watching on the big screen.