Build your FeedBlitz email newsletter subscription list faster with simple checkboxes on user registration and / or comment forms.
Yes, you must have an active FeedBlitz account and an active mailing list. The plugin has links to set that up if necessary. A demo video is at http://www.feedblitz.com/help/tour.asp
Yes. When the user checks the checkbox they will be required to activate their subscription by clicking a link in an email FeedBlitz sends to them.
If a user is already on the list FeedBlitz will de-duplicate them; they will not be required to opt in again and again.
Yes. if for some reason the plugin can't reach FeedBlitz to add the user the normal comment or site registration process continues.
Check out the FeedBlitz Knowledge Base.