Owners and Admins invite people from /admin/organization/invites. Enter an e-mail address and pick a role, or invite a list in bulk.
Each person receives a link that only works for their own address and expires after 7 days. Pending invitations are listed on the same page.
Once they accept, they appear in the member directory at /admin/organization/members with their role, team, status and when they were last active. Teams (/admin/organization/teams) group people in the directory and shape the org chart.
Seats follow your plan: up to 3 on Free, up to 10 on Pro, unlimited on Scale.
Posting and reviewing are free. Every stage, e-mail and export described here is in the console from the first sign-in.