How do I add customer or 3rd party channels and actually get them to work?

So far I've tried adding a few custom channels, and they all end up not responding or in general just not working.
The few channels I've tried are: AnimeHD, IceFilms, and USTVNOW, Ice films loaded on plex but no movies would play. They all pretty much ended up giving me the not responding msg.

The way I've been adding the channels, is unzipping and renaming it so that it ends _.bundle, and then copying it over into the plex plugins folder. I saw videos showing thats the way you add the custom channels. Still doesn't work.

So how do i get this thing working?