Since it's an USB key it will be in the Places panel ;) Otherwise, there is no need to configure, just click right of the hierarchy which is where the location bar should be. It converts this hierarchy to a real location bar.
Ooh, black magic. I love that in my desktop environment. Who cares about discoverability? I'll just randomly click on everything until I see what I want. </rant> </sarcasm>
Honestly when I tried KDE4 I was willing to put up with the hideous ugliness of the whole thing, and the fact that it wasted my screen space, if the UI was just discoverable. I was even willing to redo the themes, widgets, etc. until I discovered just how much of a discoverability nightmare the entire UI had become. Users having to resort to using Google to find out the new way of doing simple tasks is a Very Bad Sign.
Tim