To add a photo slideshow you must first create a web album at www.picasaweb.google.com. Then on this page, click "edit page." At the top of the editor, click "Insert" and select "Picasa Web Slideshow" from the drop down menu. Enter the URL for the web album you created (ex. http://picasaweb.google.com/your username/album name). Leave all of the other options how they are exept for the last option where you can give the slideshow a title.