Newsletter subscribers are associated with your popups. To see your list of new subscribers, you have to download them.

How to download your subscribers
1.
 Log in to your account
2. Select the domain in the Sites menu, placed in the Remindee header
3. Click on “Email” section in the left side menu
4. Click on “download reminder email addresses” button at the bottom of the page
5. Select a period in the calendar and click on “Download”

This will download a CSV file of your subscriber list, which you can import into your email service provider of choice