You'll need some type of ftp (file transfer protocol) software. This will allow you to move your files from your local machine to the server that the site is hosted on. Most web editors like Dreamweaver and FrontPage already have ftp included. Otherwise, there are many free ones like Filezilla and FireFTP that will do just fine. Once the software is installed, you'll need your domain name, username, and password to connect to the site.