Invite teammates from Settings → Team & Access. They get an email link and must sign in with the invited email address. Three roles:
Owner: everything, including billing and team management.
Manager: runs campaigns, creators, submissions, and payouts: no billing or team admin.
Viewer: strictly read-only: the server blocks any change they attempt.
Any member can be scoped to specific projects, so a client or contractor only sees what's theirs.