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.
Most cable channels like that still require a cable subscription. Roku isn't a method of watching cable TV for free, while some people assume that or get that perception, they don't market themselves as that nor would that be a legal business model.
Some channels offer partially free content, like old episodes & shows, with the newer content requiring signin with cable or satellite subscription for ondemand. Otherwise there is cheap pay TV like Sling/DirectTV Now/Hulu ($19.99/mo?) and free channels like Old School Social Studies with archive films & movies.