please help with address problem

Hi, this may seem like a really dumb question but this is the first website I have uploaded. I am trying to create a website at http://www.x3autoclaves.com but when you go to the page it shows a folder called x3, which is the folder containing the site. I have tried to get rid of the folder but then the style of the website is really basic. How can I get it so that the website displays at the correct address without the /x3 at the end.

Many thanks x