To activate Disney Plus on your Apple TV using a login code, first, download the Disney Plus app from the App Store. Open the app, and you’ll be prompted with a unique login code on your TV screen. Visit disneyplus.com/login/begin on a web browser using your computer or mobile device. Log in with your Disney Plus account, then enter the displayed code from your Apple TV. Once the code is entered correctly, your Apple TV will automatically activate Disney Plus, and you can start streaming your favorite shows and movies.