Learn cPanel

To connect to most FTP clients, you would basically log in using these configuration settings.

FTP Host/Address: (ftp.yourdomain.com)
FTP User: (cPanel user name)
FTP Password: (cPanel password)
Port: 21

If your domain name is not pointing to the server, then you can always use the server IP address as the FTP Host/Address instead.

*Note: If connecting to FTP using an FTP account that was created in cPanel, you will need to be sure to use the entire username. Example: user@yourdomain.com