Click on the blue invite button at the bottom of the Connect panel. Or, click on the + icon next to the 'People' header. Enter any number of email addresses to send out automated invites by email.
Existing Wavebox users - if you invite someone who already has a Wavebox Pro subscription, the Connect icon will magically appear in their top toolbar with a red notification badge displayed. When they click on it, they will see your rooms and people in your team.
New Wavebox users - new users will click on a link in their invite email to download & install Wavebox. After install, the Connect icon will appear in their top toolbar for them to start using Connect. New Wavebox users will automatically begin a 7 day free trial of Pro.
To manage people and edit permissions, click on the cog icon next to the 'People' header. Or go to Settings > Teams. You can also invite people and manage rooms in this area of Settings. See the KB article on managing team members.