There is no "flaps" channel on any receiver. You either use two ailerons in seperate jacks and they work as flaperons or you use dedicated flaps in the Gear or one of the Auxiliary jacks.

Note it can't be done if you use a "Y"for two servos or only have one aileron servo.

On the Model list go to the Flaps selection and assign how much elevator you want to add in. You have to set the switch to the LAND" choice (landing) and enter how much elevator you want. Try no more than 5% at a time.

It's page 15 of the manual.