If you use APP CONNECTION function： (1) Download “Fit Profile” app and create an account From Apple App Store (iOS) or Google Play (Android), search for “Fit Profile” mobile app, download and install to your smartphone. Open the Fit Profile app, sign up with your email. Answer Yes/Allow/OK when a few questions are prompted. Your account will need your gender, birth date, and your height. Fill in the information correctly. You may skip steps for Apple Health (iOS app), Google Fit (Android app), or Fitbit setup. You can set up these items later. (2) Setup Bluetooth connection Make sure Bluetooth is enabled on your phone. For iPhone users, make sure the Fit Profile app’s Bluetooth is on. For Android phone users, make sure Location Service is enabled. Your Fit Profile app is on the “Measurements” screen. Apply pressure to turn on your scale. When you see the Bluetooth icon display on the scale, pairing is done. (3) Take measurements with Bluetooth connections Open your Fit Profile app on the “Measurements” screen. Turn on the scale (Step on/off). You should see Bluetooth icon on the scale. Wait for the scale back to 0. Step on the scale barefoot until your measurement is done.