You can choose to have the app badge (the round red icon show on the app's icon) show:

• Nothing (this is the default)
• Number of tasks due today
• Number of incomplete tasks

To change your preference:

1. Navigate to the Settings screen (by tapping its icon in the icons on the left).
2. Tap the App Badge field and select your preference.
3. Tap Settings to return to the previous screen.

If you have Push Notifications enabled for the app, the badge number will update via this service.