How to re-pair the lock to the sensor without resetting the lock

Z-Wave Pro: everytime I changed batteries, the auto-lock function would no longer work properly, so I had to re-pair the lock to the sensor using the app. Well, I just changed the batteries again yesterday but somehow couldn’t find the option to re-pair anymore. I see that my app (Android) version is 3.2.0. Can anyone help?

@Kwong1 Hi there, we have contacted you in ticket #234898, please kindly check that in your e-mail. Thanks!