I'm gonna copy paste this from another thread, into every thread about this issue to help those like me, who found the could no longer play the game, here is how you rebind melee channel:
I Actually figured it out. All you have to do is put Archwing Move Up, or Down, On the key binding you want Melee Channel to be located at, for me it was Right Bumper. Then you rebind Archwing Move Up, or Down, to where Melee channel is Currently bound, by default Right Stick Press. This will move Archwing Move Up, or Down, to Right Stick Press, or where ever Melee Channel is bound, and the game will automatically move Melee Channel to where Archwing Move Up, or Down, was initially bound too.