How can I change the location or job requirements for a particular shift once the schedule has already been generated?
Once you have generated a schedule, any edits to shifts should be done on the schedule itself.
To change the location or job requirements for a specific shift, open the corresponding schedule and select the day from the calendars to locate the shift. Select the shift and click the "Edit Shift..." button at the top of the screen.
The Edit Shift dialog will allow you to change the number of volunteers still needed for each job, the location, time, description - all fields in this view can be edited as needed, and will only affect the individual shift that was selected from the schedule.