Samsung Galaxy S4 User Manual page 57

Notification Bar
The Notification area indicates new message events (data sync
status, new messages, calendar events, call status, etc). You can
expand this area to display the Notification screen that provides
more detailed information about the current on-screen notification
icons.
1. Touch the Status bar to reveal the Notifications tab, and then
drag the tab to the bottom of the screen to open the
Notifications panel (1).
2. Tap a notification entry to open the associated application (2).
Understanding Your Device 49