With your FTP client enter the following:
Hostname = ftp.your-domain-name.com
username and password set in helm under domains > your-domain-name > ftp accounts
For more info visit http://www.fast2host.com/support/docs/helm_eu/helm_eu_ftpaccount2.htm
Email any time or call 01480 26 00 00 014 80 26 00 00