You cannot modify a schedules dates. You must delete the schedule and begin again. The only thing that can be modified on a schedule record is the description or name of the schedule.
1. Manage Scheduling - Schedules
2. The Current Schedules listing page lists all schedules click on the edit pencil under the Actions column of the schedule you want to modify.
3. You will notice that all other fields are greyed out except for the Description field.
