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.
There's an HGTV GO channel/app, but it requires a cable or satellite TV provider. I know it's on Philo and perhaps it's also available on one of the other streaming packages from YouTube TV, Sling, etc., but any option will require some kind of payment.
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Please be aware that channel availability/access on Roku devices will vary from region to region. A Roku device will work in any location, however, channels may not be available on your device in that location, based on each channel provider's discretion. For more information, you'd want to contact any specific channel/service provider to inquire further about whether they offer their channel/service on the Roku platform in your region.