How do I get my personal events (in Apple calendar) to show up as busy in Bookings (without details)

Hello, I need to start using Bookings, but I find it completely incomprehensible and unintuitive, and I am lost! I want to have a Bookings calendar to show my availability and let people reserve time, but I need all the events in my Apple calendars to show up as busy on Bookings, so I don't get double-booked. Does anyone know how to do this? I'd like the times I'm unavailable to say just "busy," rather than "First date with George." TIA!