I'd love to add some extra capability to the transmitter shipped w/ the Iris+, the FlySky TH9X. As I tried to follow THIS article, I ended up throwing a wrench into the works instead of improving things. That's partly, or mainly, due to not being able to find and use the Edit, Insert, Copy, Move, Delete submenu seen in the article section for "Highlight & copy the CH7 setting". I couldn't tell you how I copied, moved what is now showing up as the additional CH 7 and 2 new CH 8 options (see "Mixer_Main_Menu" image). I'm positive though, I have yet to see that Copy option. I've tried long Menu press and short. Every time I'm taken to the Edit Mix screen (see "Mixer_Config_Screen" image).
Right now, w/ these settings in place, my CH 8 seen in Mission Planner, is fluttering up and down constantly and I can no longer arm the motors.
I apologize for the poor image quality. I couldn't get it any better w/ no LCD backlight and the needed external lighting.
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With some help, I was guided to the button combo I needed to at least delete all the extra rows that I had started copying and adding in error. Since I never could find that "Edit, Insert, Copy, Move, Delete" submenu, this works as a row delete:
1. Scroll down to row that needs to be deleted
2. Highlight it my pressing Menu button
3. Delete it by press and holding the Exit button
Now, to get back to adding Simple mode added to CH 8.