domain troubles

boy, THIS is a doozy…in managing my page settings through the wordpress portal on yahoo’s hosting site, I stupidly tried to knock off the /blog extension that I had set up originally. It gave me repeated errors/warnings to not do this, but would not let me change it back! Ultimately, the browser crashed, leaving me with screwed up domain mapping (terminology?)…

Anyways, now I cannot login to my ‘manage settings’ area…Is there any way I can restore old settings? Also, how do I properly map my blog to the root domain instead of using the /blog extension?

THANKS!!!