Bluetooth is a wireless connection which can be used to connect to other devices, such as a wireless headset or keypad.
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Connected devices.
Press Pair new device.
Press the required Bluetooth device and follow the instructions on the screen to pair the device with your phone.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.