Now that you have registered your Signal sensor, you will be able to collect measurements from it.
Make sure the Bluetooth on your phone is on and go as close as possible to the area where the sensor was installed, open the app and either:
Select ‘Search’, then ‘Find Nearby Devices’
Select ‘Pours’, your pour, your device, then ‘Collect Data’
Now that you have collected data from your Signal sensor, you are ready to install it on rebar.