Chimpmate- not adding subscribers to list

Hi, i have the chimp mate plugin on my wordpress website. https://www.conciencia-maghavat.com
I found out that when subscribers enter their detail to the plugin to subscribe, they don’t go automatically to the list. Neither the confirmation process happens. I have enter the key and all seems fine. But for some reason the subscribers are not added to my mail chimp list. They don’t receive neither the confirmation email, etc.
I′d appreciate some help.

Thanks