While viewing your Tasks screen, tap the Menu icon (at the upper-right corner of the screen) to access the following:
Sync now Tap to sync your Microsoft Exchange account tasks.
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.