Select the settings you want:
Use Backgrounds For Lock: Enables the lock backgrounds.
Transparent Lock: Backgrounds are not used when the screen is locked.
Backgrounds List: Displays the available backgrounds in a multiple-select list. Select or deselect a background by clicking on the list item. The last background selected will be displayed to the right of the list.
Time Per Background: Specifies the number of minutes each selected background runs before the next one starts when the screen is being saved. The backgrounds are cycled through in the same sequence as they appear in the list. A setting of 0 (zero) results in only the last background (the one currently in the preview area) being used.
To save the changes, click OK. To return to the default settings, click Default.