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.
It depends on the movie and show. Not all HBO content are free. You have to just click and check. For example McMillions is free. You will see the option to play for free without subscription. Access through Roku channel