Bax or Krysta

My question is how I can setup an opto-kill switch; assign it to a switch on the radio and which channel on the receiver would be used. Here is my set up on a 7C 2.4 for a 26cc gas airplane.
Channel Function
1 Aileron
2 LH Elevator
3 Throttle
4 Rudder
5 RH Elevator
6 Battery
7 Flaps on sw G


Rob