Ignore this if I misunderstood the meaning of your question - By "liking" the pictures you can add them to your favorites. But before that you'll have to add them to an album. I don't think, you can "like" them directly from a manga page.
you know... that other category in your personal front page that says "My Favourite" i pretty much get how to add images in my album already.
Ok, then that makes it easy. There's a "like" option under every pic of your album. When you like them(even if they are from your own album) they'll be added to your favorites. Same thing happens when you like pics from someone else's album. Till now I haven't found an option to directly add a pic from a manga (while reading) to your favorites. May be other experienced member can shed more light on this matter.
oh so that's how it's made. i'm fine with your direction, thanks.
so how do you do those include the pic in your favourites again?