To invite someone who isn't a SupraBook user to join a case team or unassigned binder: 


1) Open the sharing menu on any case or unassigned binder. 


2) In the search bar, type the email address of the person you want to invite and then click "Invite via email." 


Note: After they sign up, you can share and collaborate with them by following these instructions: https://suprabook.freshdesk.com/support/solutions/folders/48000665079