In order to create a new booking within the Fixed Time system, you simply click on the session in the calendar that you'd like to make a new booking for.
This will open up the session details page for the specific event that you've clicked on:
Here you can see any existing bookings for this session, including anyone on the wait list, and any cancelled bookings (if there are any then a group for them will automatically appear).
To create a new booking, simply click on the "Add New Booking" button, and the booking details form will appear:
You can also crate repeating booking, by checking the "Repeat?" checkbox:
or example, to create a block every week for the next year, enter "Every 1 Week for 52 times".