Before my site had https security I had uploaded a photo to the header area which I already eliminated from the media files several months ago. The source code still shows me a url-http-link to this photo. It makes my site slow because it’s in the header area and is uploaded with every page. Furthermore I am receiving the message from Google that my site is not secure because of some photos. I assume that this photo is the major problem.
How can I eliminate this http-error link (404) as shown when I scan the site?
Do I need to access source code? And how do I do that without breaking my site?
My host told me I need to contact the theme-developer for that issue, probably because the photo was uploaded in the header area.
This is what the website checking tool says: