How can i add a site to my master-password list with Firefox?

i have a master password set up so that Firefox puts in all my user names/passwords for me. when it asked me to do this on yahoo, i said no by accident. now i cant figure out how to add my yahoo login to my master password login list.
Update: i don't have yahoo toolbar. i was hoping to use the Firefox one, is there really no way to do this?
i hate additional toolbars
2 answers 2