I'm trying to use gear switch for my kill switch. I'm using a AR8000 receiver and 7 of the 8 channels are being used. I've already used Aux1,Aux2, and Aux3. Aux1 for ailerons, Aux2 for parachute doors. and Aux3 for flaps. Gear is the only open channel,How do I set gear to gear for my kill. Any help will be appreciated

I am assuming throttle cut is the kill switch?
Go to "throttle cut" and enable Gear0 or Gear1 depending which way you want switch to activate the kill