Messed up installation

When I first tried to install FC3 I kept getting an error about disk space or something. So I did the everything install of RH9, but didn't make a username and password before I updated to FC3. I have the root password, and am wondering if I could some how log into the terminal and add a username and password to log in with. Is this possible or is there an alternative to this, besides doing a full reinstall again.

Code:

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#press Ctrl-Alt-F1#
#login as root
#enter root password
useradd <name>
passwd <name>

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-lakerdonald