Something Funny in the Email Creation

I am trying to create an email/newsletter.
No matter what I type or load I get a page not found from the website.
In this case I just put “New” in the subject line and
“My Dog Has Fleas” in the body.
Nothing else.
I put screenshots on a page on the site.
http://loveandlearnchildcare.karendrena.com/101-2
Very curious.

https://wordpress.org/plugins/sendpress/