There are two accounts that are created when you install IPFire the first time. One is for the console and the other is for the Web User Interface (WUI). Neither of the two requires an email in the credentials. The console requires as username the word ‘root’ and the WUI (which you connect through your browser) requires the word ‘admin’. See the installation section of the wiki.
To reset the password you need physical access to your machine. You can find all the details in this previous discussion.