To turn notifications on or off, tap the On/Off toggle in the action bar.
Under Alerts select Vibrate to make your device vibrate when there is a new notification.
Select Device LED to make your device LED flash when there is a new notification.
Under Quiet Hours select Enable, and set a Start Time and End Time to prevent notifications from alerting you during that period.
Note: Fewer options are available when you configure an account you're not logged in to.
General Notifications
Select Posts to be notified when someone posts a message to the Conversations and walls you're a member of.
Select Your Wall to be notified when someone posts a message to your wall.
Select One-on-One to be notified when someone starts a One-on-One with you.
Select Conversation Membership to be notified when you are added as a member to a Conversation or wall.
Flags Assigned To You
Select FYI to be notified when someone assigns a For Your Information flag to you.
Select Please Reply to be notified when someone assigns a Please Reply flag to you.
You are always notified when someone assigns an Urgent flag to you.
Flags Cleared
Select FYI to be notified when a For Your Information flag you assigned is cleared.
Select Please Reply to be notified when a Please Reply flag you assigned is cleared.
Select Urgent to be notified when a Please Reply - Urgent flag you assigned is cleared.