How to replace demo images that are not in media but on shows on the page

I’m using the tesla unik theme. I have a childs theme with minimul css edits added. I installed the demo content. All the images are showing on the page. I want to replace the images.
The images are not showing in the media library or in the file manager. And, some of the code is not visible. So, I don’t know the file names to replace.

• This topic was modified 4 years, 9 months ago by Steven Stern (sterndata).

The page I need help with: [log in to see the link]