Hi, you can find the header like this:
Go to admin panel > List Pages.
Here choose Show Type: Header
This filters your pages to just show the headers. Here is the direct link: [your-website[/[admin_folder]/list_page.php?search=&r_p=&page=1&parentid=-1&pgtype=1&sort_by=
The admin panel List Pages menu arrow doesn't list out the pages on your website when there are many pages on your website - so this can be accessed by clicking on the "List Pages" menu.
I checked your admin panel - you added the photos to the original header: [your-website[/[admin_folder]/edit_page.php?id=1 - not the default one.
I moved those photos for you to the default header for you.
Please feel free to message if you have any further questions.