Your account (and for resellers, every account you create from your WHM account) comes with default FTP settings already in place. To utilize the default settings, you would enter the following information into your client-side FTP program:

FTP Address: ftp.yourdomain.tld (Note: Please replace "yourdomain.tld" with that of your actual domain name.
Username/Login: Your CPanel username
Password: Your CPanel password