This help information window can be disabled in the module settings on the right upper side Show Help information on Frontpage.
flexheader3 Help Information: The images below will be used from top to bottom. The first image wins

flexheader3 uses this folder for its images: /images/spec/ , the full pathname is: /var/www/vhosts/lyritis-bioline.gr/httpdocs/images/spec/

Name of your header-image for this site itemid178-id44
Name of your header-image for the menu entry: itemid178
Name of your header-image for the parent menu item (if applicable): no parent menu entry
Name of your header-image for the current category; category9
Name of your header-image for the current parentcategory: no parent-category
Name of your header-image for the current component: com_content

This image was found and will be used at the moment: default.jpg