You would either have to locate the RPM file for Fluxbox to install, or download the source code, and compile it yourself. I suggest checking out www.google.com/linux using the term "fluxbox" to get more information-- I believe that the people who wrote that WM will have instructions on how to install or compile the software for your system.
No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.