To get your servos to work independantly connect one to the aileron channel on your Rx and the other to Aux 1.

Programme your Transmitter for flaperons (use the menu you get when you switch on with the buttons pressed to select this). There is also a flap setting that you will need to change. This is in the menu you get to by pressing both buttons with the Tx already on. It controls the way the flap channel responds to the switch on the top right of the Tx (at least is does on my DX7!)

Terry