If you are not the administrator of the organization please get in touch with the administrator to add users.
If you are logged in as the administrator for your organization or site, click the "Admin" button from the admin screen you will be able to add a new User to any site associated with the account:
Click on "invite another user":
You could either "Invite new user to FSC OCP" or select from "existing users":
When you click "OK", an email invitation will be sent out for the person to confirm.