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.
Some channels require you to have a television subscription service of some kind. It could be a cable provider, or one of the satellite providers. it might even be possible to use something like Sling TV as your provider. But that's what they mean by provider. It has nothing to do with your Internet provider. If you don't have a TV subscription of some sort, then you can't watch those channels on a Roku (or any other device).
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.