How do I set up mixing in RF9?


I know I need to set up mixing within RF9, and not on my radio. I want to mix in some down elevator when I go to full flaps.

I selected Edit--->Edit Timber--->Radio

I can see that Channel 6 are my flaps and channel 2 is my elevator. But I can't figure out how to mix. I tried messing around with input 1 and 2 on channel 2, but now my elevator doesn't work at all. Ugh.

P.S. Can someone tell me how to set up my bind button as the reset button?
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