I don't have the radio or know anything about the FlySky stuffs, but one channel will go into the aileron port and another into an auxilary port. From there you can set up the dual ailerons through the transmitter (check the manual, it should say how to do this and what channel to plug the second aileron servo into).
But if you aren't looking for advanced capabilities like flaperons or subtrims, then just plug the 2 servos into a y-harness, and plug the other end of the Y into the aileron port.
Welcome to the forums by the way!