Are you trying to connect the device. Do you have Bluetooth built-in on your device?
If not, press the white 1 button down for 3 seconds, plug the dongle into you desktop and press and hold the fn+p button for 3 seconds.
If it has Bluetooth, press the white 1, 2, or 3 button for 3 seconds and your computer should automatically detect the Bluetooth device. Type in the pin code and press enter to pair. If it doesn't automatically detect the device, you will need to launch the Bluetooth control panel on your computer and search for the device.