Email support@dozehound.com — a person reads it.
Nothing — every channel is free until further notice, with no tier, no trial and no card. Dozehound has never charged anyone, so there is nothing to cancel and nothing to ask us for a refund of.
The TV shows a six-character code. On your phone, go to dozehound.com/link, sign in, and type it. Codes expire after 15 minutes; the TV can always show a fresh one.
Every channel is free and needs no account. If one will not play, check the TV's internet connection first — the app streams, it does not download.