A Please download the Zepp app from Apple Store or Google play store and attempt the following instructions to pair the new watch:1. Open the Zepp app and select Sign-up with an account. After you have created and signed into your user account, the app will ask you to input your details like your gender, height, and weight.2. To connect Amazfit Bip S to your phone, activate Bluetooth on your mobile phone, open the Zepp app, tap “+Add”--“Watch“--"Watch with a QR code" in the Profile page to pair.3. Scan the watch QR code, Then you will receive a pairing request on your watch. Tap the checkmark to confirm for pairing.4. After confirmation, your watch will connect to your phone immediately and it will update Repository, Firmware, and AGPS automatically. This process may take several minutes to complete.FYI. https://support.amazfit.com/us/ is Amazfit official support website, you can have FAQ, User Manual & Operation videos of Amazfit products.