#4 - Mark Playlists
Each playlist in the Playlists view has two small checkboxes next to its name:
- The first toggles "In Wallpaper Rotation" — photos from this playlist will be used when Webshots rotates your desktop wallpaper.
- The second toggles "In Screen Saver Rotation" — photos from this playlist will appear in the screen saver.
Click either box to toggle. A checkmark means the playlist is currently included. You can mark any number of playlists for each kind of rotation; Webshots draws from the combined set.

The status bar in the lower left always shows which kinds of rotation the currently-selected playlist is part of.