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/vtf.gr/public_html/images/spec/

Name of your header-image for this site itemid189-id28
Name of your header-image for the menu entry: itemid189
Name of your header-image for the parent menu item (if applicable): parent154
Name of your header-image for the current category; category13
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