To Manage Notification follow the procedures…
Manage Notification from the Notification in the left menu of the admin area.
You can search notification by notification title.
You can add pusher notification by adding App ID, App Key, Secret Key and App Cluster.
You can add one signal notification by adding App ID, Rest API Key and Safari Web ID.
You can delete any notification by clicking Delete icon from right button. - When a notification is deleted, it will automatically deleted permanently.
Here you can view all notification list and add new notification with appropriate Information.