When you first create your Core account, you'll be prompted to connect your Core. Connecting your phone to your Core is important step to getting started. Core uses Bluetooth LE to connect to your phone, so before you begin the pairing process, ensure that your Core is close by.
If you need to reconnect to your Core after setup:
1. Navigate to Settings by tapping the gear icon at the top right of the home screen.
2. Under Profile, tap 'Your Device'.
3. If you've connected to your Core before, tap 'Connect'. Otherwise tap 'Setup New Device' and follow the setup steps.