There are two ways to invite new users/friends to the site:
To invite new members using their email addresses, go to Admin Area > Users.
There you will see the Invite new members button.
1. Click the Invite new members button
2. Insert the list of email addresses (one per line)
3. Click Invite.
To enable the invite friends feature for users, the site administrator should install and configure the Contact Importer plugin. Once the Contact Importer plugin is activated and configured - the Facebook and Google icons will appear on the User Dashboard page.
By clicking these icons, a user will be able to select friends from the list and invite them to join the site.