For any event in the past or future, you can manually adjust a volunteer's hours worked at that event.
First, find your event on the Events page. If the event is in the past, select the filter icon to change the date range. Press the Apply Filters button to display your past events (Figure 1). This will change the start date as of which your administrative schedule shows events.
Click on the event you'd like to adjust hours for.
Click on the Record Hours button (Figure 2).
Change the number of hours in the field to the right of the user's name you'd like to adjust hours for (Figure 3).
Click the Save button.