WALKERA QR X350Pro - Adding a SERVO

Hi There!! , hope u can help me!! i need help installing a simple and common micro servo to my walkera qrx350 pro. im trying to install a hand-Made parachute system, and i need to add a servo mechanism in order to make The parachute open!

I have The devo F7 controller, and The DEVO-RX703A receiver...

how can i use the AUX2, AUX3, AUX4 or AUX6 to make the servo work (AUX1 and AUX5 are ocuppied with the 2d gimble pit and roll)....
on the devoF7 i have "free to use" the GEAR, D/R and HOLD/TRN switch....

can you please give me a hand?
THANKS!!
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I suspect you need more channels in the transmitter to do that.
The F7 is 7 channels and it takes 5 channels for the Quad control and 2 channels for the Gimble. Need a Devo 10. The receiver is fine it actually can handle 11 channels.