GAHA tracks volunteer hours by using DIBS. You can sign up (or claim) available DIBS sessions from your mobile phone, computer or on the tablet next to the Arena Director's office at the arena.
How do I sign up for DIBS??? http://help.sportsengine.com/customer/en/portal/articles/831027-how-does-a-volunteer-claim-a-dib-item-
Or be logged into your SportsEngine account on the GAHA website, and click on the DIBS link (far right of the screen).