YaST config

Hi people, I'm using SuSE 8.0 which I installed via FTP from a machine on my LAN. To do this I had to use a username and password to log on to the FTP server. I'd like to change the "source of installation" to a public FTP server. However, even though I can change the server address in YaST, I cannot disable the username and password. Obviously I need to be able to use an anonymous login, but YaST still sends the username and password from my original install causing the login to fail Can anybody tell me where YaST is picking the username and password info up from? I've tried poking around, but I can't find it. Cheers! sjb