In the case where you need to set specific Courts/Fields Availability different from the the Default Availability you can follow these steps.
Click the Places tab, and then click the Courts/Fields option.
Click on the Court/Field you want to set a custom time for, enter the start and end time(s), and click Save.
NOTE: If you leave a day blank the system assumes that you have no availability that day.
To confirm your availability is setup correctly you can check the schedule grid on the Drag/Drop page.
See Setting Default Court/Field Availability for setting up default availability
See Setting Custom Court/Field Availability for Multiple Weeks for setting up league availability