Luxrender set up ?

I almost have Luxrender set up
but when I try to render I get an error on the path not found !

I cannot find this thing here

\par

  • LuxRender Engine Configuration Panel:\par
    • “Path to LuxRender” is correct and absolute (not relative path).\par
  • Output panel: Valid absolute (not relative) output path, otherwise the %TEMP% directory is used.\par
    \par

where can if find this engine config panel ?

thanks

Look in the render tab and you will find a section where you choose to save your render, make sure you change that to the install directory of luxrender.