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Solucionado
back-end error with the site
when i download CintaNotes I got error:
Fatal error: Call to undefined function curl_init() in /var/www/public_html/pro/internal/mailerlite/base/ML_Rest_Base.php on line 41
Servicio de atención al cliente por UserEcho
This error doesn't matter, you will get the license key in your email. Download program from http://cintanotes.com/download/ and copy the key from the email to register.
Yes this error is about not being able to subscribe you to the newsletter. Thanks for reporting, I have fixed this error.