Setting up DJI Lightbridge 2 with a slave transmitter (Ground System) for the Zenmuse Z15-GH4 (HD) gimbal.
DJI Go app go to transmitter symbol then RC settings then stick mode and then custom you have six boxes pitch, roll, yaw, hold the symbol and drag it down to which stick you want that function to work on, the function can also be reversed by repositioning the arrow in the direction you want it to work, then go into gimbal speed and adjust the pitch, roll, yaw, speed.