Once the users of the site register for the newsletter, the admin can export a list of members that have successfully registered on the site. There are associated reasons for doing this, such as marketing campaigns, promos, etc.
To get started navigate to Emails >> View Contacts >> Once in the contact list, at the top right corner will be the "Export Contact Results" button:
After clicking the Export button, click on "Yes, continue" to confirm the export:
Finally, a CSV file with the member's information will be downloaded to the browser: