Here you can view the list of all subscribers in your site. You can search subscribers by their subscriber category, registered users, unregistered users, active subscribers, inactive subscriber etc.
You also can add new subscriber, import/export subscribers from here.
By this menu, you can manually add new subscriber to your site. Fill up the form and click Add button to add new subscribers. If everything is ok, you will get a success message. If something is wrong, you will get detailed error message.
Here you can Import all registered users as campaign subscriber. Select at least one subscriber category and then click import button to import all registered users. Note that, imported subscribers status will be active by default, i.e they don't need to activate their account by email verification.
Here you can Import subscribers from CSV file. Select at least one subscriber category and choose a csv file and then click import button.