Tap the + symbol in the upper-right corner.
Select your device.
Choose your device model.
Follow the on-screen instructions to connect your device via Bluetooth.
When prompted, check the pop-up showing your device and MAC number (a unique identifier for your device’s network interface). The MAC number is also on your device.
Once connected, you can take measurements and access your history and sync data.
After this initial connection, your device will be saved under “My Devices” — next time you open the app, you just tap your device to connect.