1. Log into your cPanel account and click on the FTP Accounts icon under the Files tab.
2. Click on the Configure FTP Client button.
3. Here you will be able to view the FTP username, FTP server and the FTP port, the password will be the password that you used when creating the FTP account.

Note that in order to use ftp.yourdomain.com as an FTP server, you should have an A record pointing ftp.yourdomain.com to the IP address of the server where your account resides.

This being said, you can always use the hostname of your server directly in the FTP server field of your FTP client.