If you have working Tvheadend backend available, you can use Kodi as a frontend to watch live TV channels or browse EPG and setup and watch TV recordings.
This guide assumes, that the Kodi is already installed. You can obtain Kodi for Windows/macOS/Linux using the official Kodi webpage: https://kodi.tv/download For Raspberry Pi, we recommend using LibreELEC distribution available at: https://libreelec.tv/downloads_new