You can use an FTP client or program like Fetch, FileZilla, ws_ftp, etc. to connect to your account using FTP protocol. This allows you to transfer file quickly from your computer to the server.
If you do not already have an FTP client installed on your computer, we recommend FileZilla. This application is a free, open-source, and extremely easy to use FTP client. You can download it from here: http://filezilla-project.org/download.php?type=client
Steps required to get started:
In FileZilla, you will see two sections. The LEFT side shows local files on YOUR computer. The RIGHT side shows the remote files on your account/server. The "www" and then "htdocs" folder on the RIGHT side of the "root" is for your website files. All you need to do is upload your site files from the LEFT side of the screen by clicking and dragging them to the RIGHT. Be sure to drop them in the right directory, and be careful NOT to highlight a directory on the RIGHT or the files will drop to it automatically.
More detailed information and tutorials for FileZilla can be found here:
Installing FileZilla Guide: http://wiki.filezilla-project.org/Client_Installation
Using FileZilla: http://wiki.filezilla-project.org/FileZilla_Client_Tutorial_%28en%29