I just purchased the Infraction v2. I'm having difficulties assigning the 3rd channel from my dx3r pro to the receiver. So I can utilize the handbrake. The radio that came with the Infraction was Dx3 and it has the 3rd channel switch on the grip.
I read the radio manual several times and looked at various sources on the web. I tired every option discussed on numerous threads.
Perhaps I need to upgrade my radio?
The solution could be simple, I could have possibly missed a step.
This problem has probably been discussed and solved but I can't seem to find the proper thread to address this.
I haven't been in this hobby for too long.
Any help would be greatly appreciated.

Thanks for you time.