After you create your organization, you can invite people to become members of the organization. You can also remove members of the organization, and reinstate former members.
You can invite anyone to become a member of your organization using their GitHub username or email address.
Organization owners can edit or cancel an invitation to become a member of your organization any time before the user accepts.
If members of your organization no longer require access to any repositories owned by the organization, you can remove them from the organization.
You can invite former organization members to rejoin your organization, and choose whether to restore the person's former role, access permissions, forks, and settings.
While you can add users to an organization you've created, you can't create personal user accounts on behalf of another person.