From the dropdown menu in the navigation bar, choose Users.
Click Invite New User.
You'll be able to choose an email address to invite to CaptionHub. If you're a Superuser, you'll be able to specify if the user is a producer or not.
You'll be able to add the user to any team you have Superuser privileges for. Users must belong to a team.
You'll be able to set initial language proficiencies for a user. (You can alter these at any time).
When you click 'Create User', that user will receive an email inviting them to set a password and join CaptionHub.