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 :
https://imgur.com/87lmmg2

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