I am using ProgTV app on my iPad and when I try and play an IPTV channel I am asked for a Login and a Parent Password

What is the Login.

How do I stop it asking for parent password?

Login and password - not parent. That mean you not have access to TV channel (server not give you access).
What TV source you use?

@phill.everett3 are you getting that with all the channels or just a few? If its all the channels are you using a cracked user/pass or mac? If yes it's probably dead. If it's your paid IPTV service it's most likely a dead channel either try a different 1 or wait a minute or 2 usually they fix the channel within a minute or 2.