How do I connect RC Channels to Relay Pins

I have a 16 Channel Radio/Receiver and want to connect Channels 9-14 to Relay pins 50 - 55.

I see the RC9_OPT = 28 set it to Relay but which one?


I checked Mission Planner and CH9_OPT is not there.

I loaded 3.3 firmware and it is there in the new version.

It still only controls relay 1 though.