How to file income tax return for a.y. 2010-11

Dear sir

I want to file income tax return of an AOP for a.y. 2010-11 . Since its belated time to file return is 31st march 2012 which has been passed, then how to file ? ?

However , on income tax website, efiling option for 2010-11 and before that is available, is it secure to file the return online? ?? ITR to be filed have nil income tax return.

please suggest