By default, VSP will block your volunteers from adding unavailable times that occur during a schedule which has had the auto-scheduler run on it, even if the auto-scheduler has not yet been run for all jobs. This is because assignments have already been made, and adding an unavailable time does not remove volunteers from the schedule. Instead, if volunteers are scheduled when they are unavailable, they should request a sub. 

However, in some instances, it is necessary to allow your volunteers to submit unavailable times for an already finalized schedule. This might occur if you run different jobs on separate schedule lengths, or if you are adding in special shifts to a completed schedule. 

In those cases, you can allow volunteers to submit unavailable times for already finalized dates by: 

1. Go to the Web Terminal pane
2. Click on Web Terminal Settings
3. Choose Profile Changes
4. Under Profile Changes, click on Unavailable times
5. Check the box that reads, "Allow volunteers to submit unavailable times for dates that have already been scheduled"
6. Click "OK" 
7. Click "Commit Changes"

Once you have finished allowing volunteers to submit those times, it is important to remember to go back and turn that setting off again.