Joomla! 1.6 FTP Configuration
FTP Configuration (Optional – Most Users Can Skip This Step – Press Next to Skip)
On some servers you may need to provide FTP credentials for installation to complete. If you have difficulties completing installation without these credentials, check with your host to determine if this is necessary.
For security reasons, it is best to create a separate FTP user account with access to the Joomla! installation only and not the entire web server. Your host can assist you with this.
Note: If you are installing on a Windows Operating System, the FTP layer is not required.