Yongnuo YN560tx Pro

[Djoliva1973]

Hello everyone. I’m new to the forum and fairly new to off-camera lighting. I recently purchased the yongnuo Yn560tx PRO. I’m trying to get it connected to yn560 III speedlight and I cannot figure out how to activate and change the group settings on the light. I can get it to trigger the flash but cannot change the settings on the speedlight from the controller. I’ve connected three 560 IV’ and all is working fine with those. I’m trying to get it connected to group C (see pics below). Any help is greatly appreciated.