There are many media players To watch all iptv channels. Here is a Guide for some most popular media players to watch iptv Channels :

VLC (VideoLan player preconfigured with optimal cache settings)

SimpleTV (Faster buffering and greater stability)

Android iptv player (The Sweetest Android HD Video Player Ever)

XBMC/Kodi (Modified advancedsettings.xml for smooth streaming)

(1) How to watch iptv with VLC (VideoLan player) 

Open VLC and press Ctrl+N (or click on Media -> Open Network Stream and paste the stream address into the box)

(2) How to watch iptv with simple tv player

Just download simple tv player install it on your computer/laptop Open it and press Ctrl+N or right click on screen -> File - Open URL and paste the stream address into the box.