As each picture in your show displays, the title bar will indicate a short description. There will also be a drop down list of descriptions for selection out of turn.
You are now almost ready to generate your slideshow. Before you do, you should check each image you have listed to be sure you typed it right.
If the picture loads in the sample, you typed it right. If pictures look distorted in the preview box that's okay, the pictures in your finished slideshow will be displayed at their actual dimensions and resolution.
To check the images,