Connecting Bluetooth headphones on Windows 10

1. Go to Start, select Settings.

2. Select Devices and enable Bluetooth and click ＋ Add Bluetooth or other device.

3. Click Bluetooth. It’s the first option at the top. Your computer will begin scanning for nearby devices that have pairing mode enabled.

4. Click the headphones that appear. While the computer is scanning for headphones If you have turned on your headphones The headphone name will appear in the “Add a device” pop-up window. The pairing and connecting process will begin

5. Click Done. It’s a gray button at the bottom of the pop-up window. Your headphones are now connected via Bluetooth.

Credit :  Pair a Bluetooth device in Windows – Microsoft Support