How do I connect my Bluetooth earphones to my Mac?

I bought an earphone QCY-T1C. I cannot find this device among the other visible on the bar. This is what I found in Internet: Bluetooth Headsets: How to Pair with a Mac

1. Open System Preferences.
2. Click Bluetooth.
3. Click the “+” sign to add a new device.
4. Select “Headset” as the type of device.
5. Put the headset in the pairing mode.
6. Click the Search button.
7. If prompted, enter the passkey, which is "0000" (four zeros).

The problem is that I don't see any + sign to add the device.

Pls help