Everybody knows vmnetcfg.exe - but with VMWare Player 5.0 it has gone missing. A lot of instructions can be found how to extract the handy network editor from the Workstation Version or download it from a torrent site.
Much easier is to use the command line - because the well known network editor is still present - but not as a single executable. In this case start cmd.exe and change to the VMWare Players install directory and run in elevated cmd.exe-box
rundll32.exe vmnetui.dll VMNetUI_ShowStandalone