Hi everyone, posted here around a month ago about some advice for the PCB board that controls my garage door. I got some suggestions to use a smart relay so I got a sonoff 4ch pro to trigger the opening of the garage door by using a wire in each START pin.

That works but the garage door opening/closing is continuous, also not sure where I am supposed to put the live wire to power the sonoff , I have the manual in the description of that image.