Hello, thank you for reaching out to Microsoft Q&A.
To turn on Bluetooth, go to Windows settings (Windows key + I on your keyboard) > Select Bluetooth & Devices in the left pane > Turn on the toggle for Bluetooth.
To add a Bluetooth device, click Devices > Add a Device.
Connect to your nearby Bluetooth devices.
Reference:
在 Windows 中为蓝牙设备配对
Let me know if you still need more help.