You can change details of any Job from the Map on the Dispatch Board. To display the Map, click Show Map.
Ensure the "Stop" tab is selected:
You will need to have the correct job selected. You can either click on the check box next to the job or click the corresponding pin on the map. To change the assignment, use the Assign to dropdown list and select a Resource. Click Update to save your reassignment.
You can reschedule the Job from the same panel. Simply type in a date in the Move to field or select a date from the calendar icon. Again, click Update to save your changes.