Volunteer assignments are managed separately from regular job assignments and can be found in the Volunteer Details section of the personnel record.
There you can add volunteer jobs (click Add Volunteer Job) and add volunteer hours (click Add Volunteer Hours) for the volunteer.
The list of possible Volunteer Assignments is established in the System Data section of the Admin/Config menu.
To view all the volunteer assignments, click on the Go to Volunteer Assignments button found at the bottom of the volunteers list in the Volunteers section of the Personnel menu. To further view all the volunteer hours, click on the Go to Volunteer Hours button at the bottom of the volunteer assignments list.