It says to click "add to favorites" button, but I do not see one. Where should it be?
while viewing all channels listing note the "star" on left side of the channel number. if it is solid, it is a favorite if 'hollow' it is not currently a favorite. using your mouse hover over the * and left-click to change the "star" from favorite or to non-favorite. if you click on while viewing your favorites they will immediately drop off the favorites list.