Click on your name in the upper right of any page in the system and choose Serving Availability.
A pop up will appear with two tabs: one for adding block out dates (i.e. dates you cannot serve) and another for setting serving preferences.
Managing block out dates
In the calendar, highlight the dates you are unable to serve. Once you have selected the dates you want to block off, a section will appear near the bottom where you can indicate more details such as the reason (optional).
Serving Preferences
To change serving preferences for any volunteer positions you may have, go to the Preferences tab. If you have multiple volunteer positions assigned to you, they will each appear here in a list.
For each position, you can indicate how often you would like to serve. These are communicated to the person setting up volunteer schedules so they are aware of them.
Tips
A volunteer cannot be scheduled to serve on a date they have blocked out. However, they can still be scheduled even if the assignment doesn't follow their preference.