If you are getting this screen it means you are getting the default index.html file.

What is happening is that when you type www.50megs.com/username it actually loads www.50megs.com/username/index.html - This is the default file that is loaded when you type www.50megs.com/username - This being the case, to stop getting this page you need to create your own index.html and copy it OVER the current index.html that is your directory. You can do this by logging into your online manager and deleting the current index.html and uploading your own index.html file.