Enable remote errors in SSRS

I am trying to enable the remote errors using the script method posted at msdn.

http://msdn.microsoft.com/en-us/library/aa337165(SQL.90).aspx

But whenever I am trying to use rs  command at the command prompt it is giving me error like

'rs' is not recognized as an internal or external command,operable program or batch file.

Please anyone help me out with the solution to this problem.

Thanks
Saurabh