Hi mate, thank you for contacting us,
1- you can see all the newsletter settings in the :
theme setting -> Pop up newsletter
check the following image :
before that, you need to create your Form With Mailchimp Plugin that in the required plugin list ( however if you import dummy data will be imported automatically )
2- please send your website URL to better help you
for more help please send your website your login information to help.kitestudio@gmail.com
to check it out