If you can’t find out who has written or published the content of a website, you should first consider if it is suitable for use in academic work. This Being Digital activity about evaluating information will help with this.
You can still create a reference by using the page title in place of the author and 'no date' for the year. You should be able to work out the publisher by checking links to the homepage, and you could use that as the author in your reference.
You can complete this short Referencing websites activity on Being Digital to learn more.