Template Import not working

I downloaded the Plugin, because I created a newsletter with Mailchimp and then, I wanted to sent it, when a new Post was published. Unfortunately this is not working. I tried to copy in the HTML Code from Mailchimp and sometimes it gives an error back and sometimes nothing happens. It would be very nice, I you could add the function to import the template from Mailchimp via a GUI interface, then add the title of the post automatically and publish it when a new post is ready.
Cheers