I happened to install the eNews plugin, put it up in my sidebar, and style it perfectly to the way I like.
I am using MailChimp, and I copy and pasted the form action into the appropriate field.
When I input an email into the subscriber sign-up, it leads me to a page that says "Page Not Found, error 404". And the page looks just like my actual website.
Is this a problem where I did not copy and paste correctly into the widget? Or is there more that I must do on the MailChimp dashboard?