Rovelight transmitter question

I have three rovelights. I use them with Yongnuo 622tx and receivers. I read that you can change the power levels with the TRS transmitters that come with them. If I am using three lights do I have to use three separate transmitters to change the power?? Is there a better way to change the power levels besides reaching behind the lights?

You can use one transmitter for control - you just have to change the channel to change which strobe it controls.

Ok I wondered if that was the way to do it