To enter your 8-digit Disney Plus code, first, open the Disney Plus app on your streaming device or smart TV. When prompted, note the 8-digit code displayed on the screen. Then, using a web browser on your phone or computer, go to the website disneyplus.com/begin. Sign in with your Disney Plus account credentials if required, and enter the 8-digit code in the designated field. Click the "Continue" button to link your device to your Disney Plus account. Once the code is verified, your device will be activated, and you can start streaming content.