Hi mustangshooter
The change you need to make is a mechanical one, at the servo. Look at how the ailerons are mounted. One aileron must go up while the other one goes down. What would you do, mechanically, to the aileron servos to get both to move up at the same time? Do that type of change to your flaps.You may have to move the servo arm to the other side, or turn the servo over. This all depends on how they are mounted. Take some photos showing the servos and rods, post them here, and you will get the correct advice. Since our models do not require flaps, you may want to postpone using them.