This option isn't in 2.5 anymore?
Everyone has the possibility of offering channels (see also providing tv listings). So that each user can activate these channels comfortably in the TV-Browser, there are the so-called channel groups. Each provider produces his own group of channels. A list of the channel and channel groups can be found here. To find new channel groups, simply click on "Refresh list". Now the TV-Browser will connect to our server and gets the list of known channel groups. These can now be activated or deactivated individually. After you've activated a new channel group, you should update the channel list and subscribe to the new channels.