Futaba 14GS adding DYS 3 axis gimbal?

[Macdougal]

I have a F550 with Futaba 14GS and would like to add a DYS 3 axis gimbal. I am a beginner and totally lost on how to do this.
I did a little research and found someone suggesting adding a FrSky SBUS & CPPM Decoder with Pins for the additional 3 channels.
I am open to whatever it takes to get it done but need some help pointing me in the right direction. Thanks...