First are you going to need a FTP program. Some popular ones are smartftp (smartftp.com), WS-FTP (ipswitch.com) or cuteftp. We recommend using smartftp or Filezilla

When you open the program you will need to enter your host location yourdomain.com where yourdomain.com is your actual domain name.

Then enter the username and password you were assigned. When inside your account you should go inside your web folder to publish.