how to type in hindi

Wed Feb 1 13:49:46 UTC 2012

2012/2/1 সাজেদুর রহিম জোয়ারদার <toshazed at gmail.com>:
> Dear Abhishek
>
> Goto your system keyboard preferences and add the default indian keyboard
> layout there. This will enable the feature to get your keystroks and display
> the hindi characters as you type.

I have only English US keyboard.I am using the same to type in Hindi
and where exactly are these system keyboard preferences?