Getting a 'Not Found' error on my website?

I'm trying to upload files to my domain that I'm hosting with Dreamhost. I connected to the server with FileZilla and I'm pretty sure I put the files in the right spot.

Their tutorial says to create a directory with your domain name like this: 'mydomain.com' and put your files in there. I put an index.html, p.css, register.php, login.php, and logout.php file in there. However, when I navigate to mydomain.com in Google Chrome, all I see is this:

enter image description here Does anybody know what could be causing this? BTW I didn't actually create a directory called "mydomain.com" I used the domain I own.

UPDATE:

The directories are set up like this:

/
    mydomain.com
       public_html
           register.php
           main.css
           logout.php
           login.php
           index.html

Solution

I finally figured it out. For some reason it wasn't working when the directory was labeled mydomain.com. I changed it to mydomain_com and it fixed it for whatever reason. Thank you to cevaris and Amazed for helping me.