Dale i don't personally own an JR12x but i have had several JR transmitter and i have setup a plane for a friend who owned a 12X. Are you going into the system mode by holding down the enter button while turning on the transmitter? That is where you will find the wing type. To have flaps you have to select normal in the wing type to be able to have flaps set up. You can't do flaps in the ffapperon mode because that makes Aux1 which is the flap channel by default the aileron channel for the left wing. Hope this helps some
Mel