1. After connecting to the Haylou Fun App, it will automatically sync. 2. Pull down on the Haylou Fun App homepage to sync. 3. If you encounter a connection failure message during syncing, please check if Bluetooth is enabled and try the following: First, close the App and reopen it; if it still doesn't work, please toggle your phone's Bluetooth on and off or restart your phone. (Before restarting your phone, you can also try clearing Bluetooth sharing information in your phone's settings).