Always use the Alchema app to control your device. Do not try to connect through the system settings on your phone.
When you open the app for the first time, it will guide you to set up Bluetooth and WiFi*. You can interact with your device to learn all the functions. If you want to repeat the process from the beginning, simply go to Settings.
*Bluetooth controls your device, while WiFi is for remotely uploading data about the