How do I change the notification settings on Facebook?

[Louise]

Update your notification settings. Click Edit next to the notification types you want to receive and make sure the appropriate boxes are checked.

When you've selected to only get summary emails of notifications, you won't be able to adjust individual notification settings.
To turn summary emails off,
Go to accontsetting >> notification >> unselect the Email Frequency option at the top of the notifications page and edit the all notifications.