You can change the company name of your account by visitng the settings page and changing the information in the text box labelled 'Company Name'.
Please note that your company name is included in the URL for the link to the web version of you eBook.
So for example, books that you already made are available at a URL with this structure: http://beacon.by/company-name/book-title
If you change the company name within Beacon then the middle part of that link will be updated with the new company name. Therefore the original link will not work.