Is this the transmitter? http://www.hobbypartz.com/79p-ct6b-r6b-radiosystem.html

Does the radio work with your trainer? Or, do you have a radio that works with it?

I searched for online manuals and found some links on this page http://www.mycoolheli.com/t6config.html
The one that appears to be the 'official' manual does not describe mixing in enough detail for me to understand it without having the radio and plane in front of me to experiment.
The 'expanded manual' has a lot of info but is explaining heli setup rather than plane.

You might post a new thread in the radio forum http://www.rcuniverse.com/forum/forumid_157/tt.htm
Title it something like 'Need help setting up delta wing mixing in Fly Sky transmitter'