Great response from frank_gm! Just to add to that, once you've selected Favourite Channels, you'll be presented with a list of all your channels. You can then select Thumbs Up to mark a favourite channel or Thumbs Down to remove a favourite.
Once you've selected all your favourite channels, just press Home on the remote control, select TV Guide, then select Favourite Channels.
Hope this helps!
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I've already got some favorites ....I forgot how to add more, found answers here.....one uses the thumbs up and thumbs down buttons.....but I've now pressed thumbs up and the guide shows that I've pressed thumbs up......
But then going into favorites the program is not there....why???? (is there a limit in the favorites???)