To log into Disney Plus after activation, follow these steps. First, open the Disney Plus app on your device. A code will appear on the screen. Then, visit disneyplus.com/begin on a web browser using your phone or computer. Enter the activation code displayed on your device and click "Continue." Log in with your Disney Plus credentials, and your device will be activated. Once completed, you can start streaming your favorite shows and movies. Ensure you have an active subscription and a stable internet connection for a seamless experience. Enjoy Disney Plus on multiple devices hassle-free!