As an anonymous reader of the website, it is simple for me to add myself as a member to the website.
As an anonymous reader of the website, it is simple for me to add my organisation to the website, and it requires me to make myself a member (of that organisation).
As member of the website, it is simple for me to add my organisation to the website, and it requires me to make myself a member (of that organisation).
As a member of the website, it is simple for me to add myself to an existing organisation that is on the website.
As an administrator of the website, I can add or remove members to an organisation on the website.