One of the benefits of FamilyProperty's integration with Smokeball is that you don't need to set up a separate FamilyProperty login for all your users. All your Smokeball users can access any matter in FamilyProperty directly through smokeball.
The person that subscribed to FamilyProperty originally will be set up as the Account Owner and will have Admin access. If you wish to add more Admins to manage your FamilyProperty settings, you can do this by:
Opening FamilyProperty via a matter in Smokeball, then click on the cog icon > Users
Log into FamilyProperty separately, go to 'Account' in the main menu, then 'Users'
Save your changes.