Inviting people and roles

Viewer, editor, approver, admin and owner: what each may do.

Invite people in Settings → People & plan. They get an email with a link (or you copy the link).

Viewer: sees everything in the workspace.
Editor: also drafts, schedules, uploads and triages the inbox. Their posts wait for an approver.
Approver: an editor allowed to approve posts and send replies and DMs.
Admin: also settings, accounts, rules, keys, webhooks, people and pausing the workspace.
Owner: also deletes the workspace and hands ownership to someone else.

Activity (Settings) shows who did what.