I’m working with pixhawk mini 3dr, and I’m having problems with connecting with the RC. It’s written it needs 5 channels, and it’s 0 channel. I need help with this

What RC transmitter model?
What RC receiver moder?
What Ardupilot Firmware version?

Did you read the documentation ?

ps. if you want help from this website you should install Ardupilot instead of PX4 firmware.

I have radio link R9DS V1.5 receiver with radio link AT9S transmitter
The firmware v3.4, chiboti:ArduPilot