First open up Windows Explorer. There are many ways to open it:
It will pop up an error message saying that you are an annonymous user and therefore cant access the folder. Just click 'OK' and then we will login.
In Windows Explorer, Click on File -> Login As... This will display the following dialog where you will enter your onyen and associated password.
After you click the 'Log On' button, you should see your files on the server. Place any files you want to be accessible from the internet in the public_html folder.