Depends on the year. See post #14 and onwards in this thread for more explanation:

https://www.avforums.com/threads/ford-focus-6000-cd-is-it-bluetooth.905845/

If yours does have Bluetooth module then these how to videos might help:

https://m.youtube.com/watch?v=Ofl6lvLoKBI

https://m.youtube.com/watch?v=UDt6ackyN94

https://m.youtube.com/watch?v=fTZmW9tXs3c

Phgr
July 2022