new to IPTV

Hi All, I have a receiver which supports IPTV but I cannot access any channel so far, I need to populate it with IP address I guess, I spent all day looking around and I thought to ask you guys and if you could please help how to get the channels I want.

The question is, do I have to literal type in the IP address into the receiver in order to get those channels and where can I find those IP address.
thanks