Blackout Schedules can not be modified once created, they must be deleted and a new schedule created.

Step 1 - Blackout Schedule

Click on Blackout Schedule under the Restrictions heading at the bottom of the page.

Step 2 - Select Delete

From the drop-down list select Delete

Step 3 - Select the Schedule

Check the box next to the schedule to delete

Step 4 - Save the change

Click Submit to save the changes