Thanks Lisa,
Your solution isn’t correct but I figured out the problem. The templates on the page I linked to above are titled wrong. They are titled header.html when PMP is looking for email_header.html. Even though the directory you said to put the files in was wrong it was the file name of the URL that helped.
They files do go in the the /wp-content/themes/MyTheme/ directory.
Sorry I didn’t quite understand what you had said before and I was looking in the wrong spot. It works now. A little embarrassed that it was a simple solution. Thanks for the help!
On the left side there is a section “Recommended Sites” in the wordpress this is the links. When I want is the image and not the text. Right now I have the text otherwise there would be nothing there. I have added the image path to the image uri field and nothing shows up on the site.