The Voodoo PS/2 patch is already in the customize menu system - voodoo ps/2 driver of the (iATKOS) MACOSX installation disk... you just reinstall over the already installed OSX system.
In a couple of words you just have to start again the installation but don't erase anything just add the voodoo ps/2 patch...

I repeat NOTE: Don't forget to write down the patches you use.... you will need them in case something is not working with the installation!!!!!