520fd03 created the issue

I'll try my best to explain the issue. I'm a complete beginner when it comes to coding and editing websites. The website for my business, New Stone Age, was set up by a former employee and the info is no longer correct. I downloaded Cyberduck so I could edit the sections and upload them to my server (OMNIS) via FTP. The problem is when I click on the URL for the edited info, I am directed to a blank page with the phrase "Unknown Virtual Server." If someone can explain to me in the simplest terms how I can make this edited info appear on newstoneagela.com, I would very much appreciate it.