First make sure your Kodi is 2020 updated to latest version so that the guide below dont seem misguiding.
The tutorial below is for PERSIANTVBOX IPTV Simple client addon on Kodi.
1-Open Kodi client
3-Select TV or if your version is not updated it might appear as Live TV
6-Once a pop-up appears saying you have no PVR client enabled, just select OK
7-Scroll down and choose PVR IPTV Simple Client
10-In Feneral, select M3U Playlist URL
11-Now add the M3U url you`ve got from your provider into this section
12-Select OK twice
Now, once Kodi starts, on your screen you should see TV or Live TV, Click that and choose a channel to play.