How to enable CH9 and Ch10 to control gimbal on Matek F765?

I have a BCG gimbal controller and I want to control pitch and roll motion from RC radio. What parameters do I need to enable in Mission Planner? I have removed the power wire between BCG and F765 since I only need to send PWM signal to control the pitch and roll.
Stabilization is done by BGC controller.

I am posting this under Arduplane because that is what on the FC.