Browse to the Preferences Tab:
Click the 'Idle/Splash Screen' button:
The Splash Screen will show AFTER an activation is selected (photo, video, GIF etc)
The Idle Screen will show BEFORE an activation is selected. In other words the Idle Screen acts like a screen saver. Here you may load an image file, or a video file. After 60 seconds of idle time the Idle Screen will appear. Users will touch the screen to begin their session.