You can easily edit all m3u or m3u8 playlists with Notepad++ text editor, if you open m3u playlists with this editor (right click on it and choose edit with notepad++), you will see list of channel links and name of channels like in example :
Editing m3u playlists :
Each m3u playlist starts with #EXTM3U line and continues with #EXTINF:-1, and channel name. You can edit channel name how you want.
After channel name line comes the channel url, for each channel there should be different url. You can not edit channel url, If you change it, channel won’t work.
After you finished editing m3u playlist you can save it with Ctrl+S buttons.
m3u_plus playlists :
m3u_plus playlists are little bit different from normal m3u playlists. They contain more information at #EXTINF:-1, lines, not only channel name. But you can also edit them with Notepad++.