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