"Slideshow" content box is used to insert a collection of dynamic shots especially in the header of the site. Many configuration options from the slideshow creates a very useful and easy-to-use marketing tool.
Use the "Insert" > "Gallery / Slideshow" command located in the top menu bar.
As a result, at the bottom of your web site is added new content box named "New Slideshow".
Now use the "pencil" icon located on the gray navigation bar of the new content box to edit it.