No matter what you’re trying to pair with your phone, the steps are the same:
Turn the Bluetooth device to pairing mode (this varies by device).
Open the App drawer on your phone (the circle with 6 dots at the bottom of the Home screen).
Select Settings > Bluetooth
In the top right corner, touch the ON/OFF box to turn Bluetooth on.
Under Available devices, you should see the device you just turned to pairing mode. Tap it.
You’ve now paired a Bluetooth device with your phone. If it’s a Bluetooth speaker, you can now use it to listen to music. If it’s a Bluetooth headset, you can now use it for calls.