Roku TV also allows you access to Disney Plus. Roku TV. Before connecting to the service however, you'll have to install the Roku TV. Before you can start the process, be sure you install and set up the Disney Plus app on your device.Log into disneyplus.com/begin from Roku TV. A code to activate your account will be provided to you upon logging into the application. Now visit the link "disneyplus.com/begin" from your web browser and enter the activation code. Then, click the "Activate" button, and let the system match and process your code. After the processing has been completed after which you'll be able to access the entire Disney Plus content on Roku.