Open your ftp client and set ‘host name’ to ‘hal-pc.org’, and the userid and password to your own.
Try right clicking on the client window to see if you can activate a pop-up window with 'FTP Commands' or 'SITE' as one of the options. If this does not work, check the documentation for your particular client to see how to activate the 'SITE' command. If 'SITE is an option, select it. If 'FTP Commands' is an option, select it and see if you can then select 'SITE' from the options.
The 'SITE' command should provide a dialog box in which you can type the following: