The main window is divided into two sections.  View Picture

The left half lists the pictures that you have added. The pictures are listed using the caption provided when the picture was added. The actively selected picture can be edited or deleted by either right clicking the selection, or by using the File menu. The caption above the list is the filename of the currently selected picture.

The right half is a graphical representation of the currently selected picture as it would appear as wallpaper. Please note that this is a reduced quality representation.