I use wolfbox 433 hrz long distance reciever and tx on mu FlySky 9x radio control..PPM problem

Hi ! I use Wolfbox long distance tx rx with my FlySky 9x radio control. How can fix or setup PPM directly on the Pixhawk? I contacted from board to PPM pin of the wolfbox receiver but unfortunately I forgat how can I setup on the radio control PPM as control servo1 and 3 and throttle? I activated PPM also…Does anybody know? ar support me?