To add members to your team go to Dashboard > Team.
Type in the user's email address and role then hit the Invite button.
The following roles are supported:
Reports only - see and download reports for all stories in the account.
Member - Create and edit their own stories, and see reports for their stories. They cannot publish a story or edit a published story.
Editor - Edit and publish any story, and see overall reports.
Admin - Has all the rights under Editor plus the ability to change account settings, billing details, invite new team members and change user roles.