First time set up

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I have not heard of Fetch TV. Jellyfin has clients for download on a variety of platforms like Android (mobile and TV), Roku, webOS, iOS, Windows, Linux, etc... So you would need to download a client on a device and either a) use that device for viewing -- probably your TV or a set-top box or b) cast to a compatible set-top box like a Roku, Chromecast, etc...