Log into your organization's website.
Click on Account in the top left.
On the left hand side you'll see "Notifications"
Under "Mobile Notifications" you can change your preferences.
Off - No notifications about changes to games or other events
All - All notifications about changes to games or other events
All Games. Other events in the next 14 days - Notifications about changes to all games. Only notifications about changes to practices and other events in the next 14 days.
All events in the next 14 days - Notifications about changes to games, practices, and other events in the next 14 days.