This is how i set up crow on my 9503 for my Ultra Lightening.
go to mix 5 if not in use all ready
Make flap the master channel and fprn the slave channel
Down at the bottom of the screen you will see fm0, fm1, fm2,ail,ger rud, and mix
all the boxes should have the bar in pos 0 position
scroll over to fm2 and make the bar go to position pos1
now you have to turn your plane on and then scroll over to the percentages on position1on your transmitter and you will probably have to put a negative amount
hope this helps
Mel