Tactic TTX850 differential thrust

[Vermillon_baron]

I'm trying to program differential thrust on my Tactic 850 transmitter but I can't seem to figure it out. I watched the flite test video on mixing differential thrust but my transmitter has a completely different mix set up menu.

 

[French]

I can't seem to find anything directly on it in the manual.
http://manuals.hobbico.com/tac/tacj2850-manual.pdf