If you closed the TFS Configuration Wizard accidently after installing TFS (2010 or 2012) binaries, you will be prompted with the Configuration Manager window. There is no link in the Windows Start menu to open the Wizard again.
You can simply open it via the following command (Start –> Run…):
C:\Program Files\Microsoft Team Foundation Server 2010\Tools\TfsMgmt.exe configure
C:\Program Files\Microsoft Team Foundation Server 11.0\Tools\TfsMgmt.exe configure
And it reopens again: