How to make a relay board forget the RF signal

I picked up some relay boards that work with sonoff & also have the RF facility. Now sonoff dont make a 10 button transmitter, so i picked up a leaning RF transmitter & all works great. Problem is i put one relay board on the wrong button & cant get it off. Is there a way to unpair the board from the transmitter. I tried to pair another board on the button & it just made 2 boards switch on/off.
I take it this is done at the board end??. Thanks

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If there is no instruction and you just need to separate the board from the radio signal, then try to fall out the antenna.