To Turn off the Newsletter feature, and the option to sign up for one on your website, you will need to login as an Admin or use the Owner account.
Then follow these steps:

1. Login to the Admin Console - https://admin.insurancewebsitebuilder.com
2. Go to Account Settings at the top
3. Click on Account Information or:
4. Click on Account Information under Account Settings on the Home page
5. Scroll down to Miscellaneous Settings
6. Uncheck Enable Newsletter
7. Click on the button marked Update Miscellaneous Settings
8. The feature will be removed from your site automatically.