Changed to Broadband and now can't connect to Smart FTP ...HELP

Help needed please....have been using Smart FTP for a few months now and was set up by a mate. I recently changed ISPs and am now on Broadband but can't seem to work out how to change the settings across. The webspace my site sits on is owned by my old ISP and my dial up account is still live. In the address bar, should this be my new ISP or stay as the location of my webspace which is my old account?

Sorry for being a dope

Cheers
Andy