Header Pictures

i try to add new 6 pictures for the header of the Explorer template and i add the new pictures to
images/carousel
after change the size to 1800*515PIX
i can see this new pictures in Joomla panel in media and in my files manager in hoste but nothing in web site and pictures still same old as template

what i can do?

Thanks
Husam

Did you enable them? Post snapshots of your carousel content slots