Modifying the State of a Notification
When you have read a notification or when you no longer want to keep it in your list of read notifications, you can change its state to "Notification unread".
To modify the state of a notification:
1. Access your notifications.
2. In the drop-down menu, select My Read Notifications.
3. In the notification concerned, click Mark as Read 
.
. The notification is moved to My read notifications.
In the same way, click Mark as unread 
to move the notification to My unread notifications.