I think your remote has a button with three horizontal lines on it. If that is the case, press it when you are on a channel that you want to add to favorites. A context menu will pop up with add to favorites as one of the options.
The remote only has 6 buttons i-for volume 2-for up down left or right movements 3- to turn machine off 4-- mic 5--for return 6-- to go to home, that is it. There are no horizontal lines.
Dot