If you are an organizer of your area, then from here you can invite new members to your area, change the role of existing area members, of remove members from the area entirely. 

To invite members to your area, select the invite user command [].  This will display a field that looks like the following:



Enter the email addresses of the users that you want to add into this field and select the invite users button.  Each of the users will be added to the area and will receive an email telling them that you want them to join you in your area.