Your computer needs to have a bluetooth interface, built-in or in the form of a USB dongle. Then you need to go into a process of discovering, connecting, pairing and bonding. This means that typically your BT device starts emitting its presence (this is called advertising), and in your BT manager software you pick this up and pair with the device. Sometimes without a "secret", sometimes by entering a passcode, depending on the device.
How to hook your bluetooth to your computer?