Create slideshow by using 'Create New Slideshow' below. When you create a slideshow from here for a widgetized page of your site, it gets automatically placed on that page. It is recommended that you create all your slideshows from here, and not place them on the pages from the Layout Editor, as it would not work. You can also create slideshows for non-widgetized pages of your site.
You can also edit, manage and delete slideshows by clicking on the links for each. You can make slideshow enabled/dis-abled and you can see preview by clicking on the preview links for each.