Open the Tasks app, tap the Menu key to access the following:
Sort by – Tap to select Due date, Priority, or Creation order.
Delete – Tap to select tasks to delete.
View completed tasks – Tap to view your list of completed tasks.
Lists to display – Tap to select which lists to display.
Settings – Tap to change your Tasks settings including Notifications, Notification sound, Vibrate, Pop-up notification, and Accounts.