Most of these you press a function button to cycle through modes, one of which will be to change the channel. Make sure all units are on same channel number.
Press and hold the + button untill the frequency changes then move up and down to the one you want.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c
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