I can’t book a private class in the agenda.
@Lahaye welcome to the forum. If you have the booking page connected to your calendar (agenda) any booking should be making it to the calendar. Can you provide additional context on the issue. Do you not have availability?
This is not on YouCanBook.me this appears to be a different platform. You can register for our tool here: https://app.youcanbook.me/#/register. You can integrate your Google or Microsoft calendar and then we will pull in your availability. Any blocked time on your connected calendar will be blocked on the YCBM booking page.