If you don't have the manual to go with the DMD, I would stick one wire at a time into the receiver ELEV channel and push the right joystick up/down to see what it does.

Receiver Channels:

* THRO (throttle) - Channel 1: left stick up/down
* AILE (aileron) - Channel 2: right stick left/right
* ELEV (elevator) - Channel 3: right stick up/down
* RUDD (rudder) - Channel 4: left stick left/right
* GEAR (retracts) - Channel 5: top left toggle switch
* AUX1 (flaps) - Channel 6: top right toggle switch