To watch Disney Plus on an Apple TV, start by downloading the Disney Plus app from the App Store. Once installed, open the app and select "Log In." You will see an activation code on the screen. On a computer or mobile device, visit disneyplus.com/login/begin and enter the code displayed on your Apple TV. Sign in using your Disney Plus credentials, and the Apple TV app will refresh automatically, giving you access to all Disney Plus content. Enjoy your favorite movies and shows on Disney Plus right from your Apple TV!