You can use any FTP client to connect to your site and upload files. We highly recommend using FileZilla. FileZilla is a free FTP solution which can be downloaded by visiting the following URL: https://filezilla-project.org/
You will want to download the FileZilla Client, not the FileZilla server.
Upon installing the software, you can use the following settings to connect via FTP:
FTP Hostname: ftp.yourdomain.com (Replace yourdomain.com with your own domain name)
FTP Port: 21
Encryption (if available): Use explicit FTP over TLS if available
Username is your cPanel username. This would have been sent to you at signup.
Password is also your cPanel user password which would also have been sent to you at signup.
If you have any questions or issues regarding this, please feel free to submit a support ticket by visiting https://secure.hostduplex.com/clientarea.php