Here's how to reset your root password:
https://fedoraproject.org/wiki/How_t..._root_password
The typical way to use a pendrive is that, when you insert it, it shows up in your File Manager. It may be that you are unable to do this without knowing the root password, is that the problem here?
HOWEVER since Fedora 14 is obsolete and unsupported, I recommend you do a fresh reinstall of the current Fedora 17, or a beginner-friendly distro such as Linux Mint.