1. In order to activate the pop up promo do the following:
A- go to 8themes options->ecommerce->popup promo and activate it.
B- the popup promo is a static block. To edit it go tostatic blocks then select popup promo.
I advise the use of WPbakery page builder to edit it. In order to add a newsletteryou have to create a form in mailchimp and add it there.
2. If you want to allow users to register, you need to activate that via woocommerce.
To do so، go to woocommerce->settings->accounts
Then under the my account page check the “allow customer registration on “my account” page.”
I followed your instructions and registration is working fine now.
But I am not able to figure out the pop up issue. All the settings are same as you mentioned. Can you please go to the website and just see how it is appearing.
Site URL: hidden Theme version: 4.13 WooCommerce version: 3.2.4