Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
Re: Adding Existing Amazon Prime Video subscription
@Rigsbee Thanks for the note! Roku is a device platform that allows you to install channels (apps) to use/access services. You'll only need to install these channels from 'Streaming channels' on your device's Home screen, then use the option to sign in to each channel once you've installed them.
If you need more help logging in, feel free to reach out to Amazon Prime and/or BritBox support directly.