The Information section tells you how many images are needed and that (in this case) you have chosen One Image and that 16 Images are required to make the Style work. You can click on Add Images to add the necessary images.
In the Duration section the Speed and Full Duration are interactive. Lowering the Speed will increase the Full Duration and vice versa.
The Options Section allows the Text to be added/edited before clicking on Apply.
The Author section shows the Author's Name and any notes added when creating the Style.
Click on “Apply” to Apply the Style.