Adding a Caption
Adding captions to an Image, Video, or Document slide is easy. Just go to the Content section and open the slide. Then type into the Caption box. Captions cannot be added to Banner or Event slides.
Captions can be displayed continuously, or only when your visitor hovers over the slide. This can be controlled by going to Design >> Caption >> Caption Display
Position of Captions
You can also choose where your captions will appear on slides. Go to Design >> Caption. You can control horizontal position with the Text Align dropdown, and vertical position with the Caption Positioning