Hello there, Harry278.
To pair a bluetooth device with your Mac, there is some great information in the following Knowledge Base article:
Wireless input devices: Bluetooth frequently asked questions - Apple Support
Use the Bluetooth Setup Assistant to set up your device to work with your computer by “pairing” the device with your computer:
- Find the Bluetooth icon in the menu bar in the upper-right of your display.
- Choose Set up Bluetooth Device from the Bluetooth status menu.
If the Bluetooth status menu isn’t visible in your menu bar, use these steps to open the Bluetooth Setup Assistant:
- Choose System Preferences from the Apple () menu, then choose Bluetooth from the View menu.
- Enable the "Show Bluetooth status in the menu bar" option.
Learn more about pairing your keyboard, mouse, or trackpad with your Mac.
After you pair a device with your computer, you should see the device listed in Bluetooth preferences.
Thanks for being a part of Apple Support Communities.
Cheers,
Pedro.