As someone that been around these boxes a long time.
I rarely, like never, edit the favourites list.
To me favourites is not favourites. Its basically a bouquet (folder) of all your scans. Although it is in reality a favourites. It just has multiple uses.
If you also are using any iptv bouquet creators, things can also get a little messy.
You have used AutoBouquetMaker to do your scan. So they will be listed in here.
Also in ABM, you can hide sections. like kids, religion etc. To get rid of a lot of the noise. If you have already done a scan. Hide things you dont want in AMB and rescan.
If you have done a manual or auto scan of satellite. They will also be in here under "last scanned".
If you really want to experiment - and do it all via your box.
Enter channel select - Up or down button.
Press blue button - favourites
press menu - Add bouquet
Create a new bouquet. i.e Test
Then as cliahew as described above
Scroll through your channels. Any you want to add to your new bouquet, Press menu. Add service to bouquet. Click OK on your new bouquet.
All your favourite channels will now be in your new bouquet.
Other people tend to delete and move stuff around in bouquets. This isn't a great idea as soon as a scan runs or an iptv bouquet maker plugin runs, then everything gets reset.
So creating your own bouquet and copying channels into there is a better option.