H8 is supplied with a clean install of Android, Kodi, plus other apps like Youtube/Chrome etc.
When you say 'watch TV' it could mean various things.
Most TV channels now have Android apps (in the UK, BBC iPlayer, ITV Hub etc). These can usually be installed for free from Play Store. Go to Play Store icon on home screen, log into / sign up for a Google account, and install the apps.
Kodi can be used to watch all sorts of media content, much of which is pirated. Discussion of which is not allowed on this forum.