more 530 problems

I'm a first time user of SmartFTP but can't connect. I have been using another uploader (FireFTP) from Mozilla, which works fine. My Smart 530 errors says it is having problems connecting to "Yahoo" but Yahoo is not my host????

If it is any help, I used to host with Yahoo, and I still register my domain names throgh them, but I use a different company to host my domain.

This is how it comes down:

[20:29:58] 530-Your FTP session could not be opened.
[20:29:58] 530-If you continue to have problems, please visit:
[20:29:58] 530-
[20:29:58] 530
[20:29:58] Active Help:
[20:29:58] Cannot login waiting to retry (30s)..