Check out the receiver and modes tabs in betaflight need to have receiver tab showing bars moving based on stick movement. If no movement in receiver tab work on that first, can change the protocol for receiver in the configurator tab in betaflight and can change which UART or input on FC is chosen for receiver input on the ports tab.
If sticks move in receiver tab and correspond to correct sticks (left throttle and yaw, right pitch and roll for mode 2 which is typical for quad pilots) and assuming switches make aux channels respond then can choose and use aux channels in modes tab.... Really best to watch vid of checking out receiver and modes tab to better understand them. Sure Joshua Bardwell has done endless betaflight setup vids just follow one of those
