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Account Settings is your login (email and password), the people who share your organization, two-factor authentication, and your HOST subscription and invoices.
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Sidebar footer → Settings (/settings/account).

Account Settings: Profile, Team Members, Security, Active Subscription and Invoice History.
Everyone with access to the selected organization: name, email, a Pending badge for invitations not yet accepted, and their role (Manager, Contributor or Viewer).

The Invite a team member dialog: email, name and the Viewer / Manager role.
Trash icon on the row → Remove member (or Revoke invitation for a pending invite). You can't remove yourself.
Pencil icon on the row → pick Viewer or Manager → Save role. You'll see "… is now a Manager." (or Viewer). A pending invitee gets the new role when they accept.
Everyone else sees "Only managers can invite, edit, or remove team members."