Yes you, can work my hours at more than one of the approved selected locations. 

When you fill out your timesheet, it's really important to only write down the places where you actually volunteered. VolunteerNow can only count hours worked at the places that are already on your list. If you write down a place that's not on your timesheet, we won't be able to approve those hours. So, double-check your list before you fill anything out.