Sorry you are having such a hard time. There should be a permanet jumper between the common and the NC terminals. Then your switch should be a single contact between the NO and Common. When you close the contact, there should be an activation (LED on) of the UT3000 for a brief period of time, then turn off. This should be equivalent to pressing the built-in pushbutton on the UT3000.
I’m assuming the pairing of the UT3000 and the EZSnsRF is done using the pushbutton on the UT3000.