Cant figure out how to use an app

Paid $$$ dollars for treadmill that came with instructions to download iFit app. Installed one and it offers no choice to connect treadmill but gives a list of wearable devices. Select any and it will show treadmill available on Bluetooth. But that is it. Sync to device will stop in the middle with no indication why... Dashboard will disappear unless application is killed and started again. Still not working for me...

Trbmaker about iFit | Revolutionary fitness tracking, v2.1.0