Dear
Yes you can file it online if the same is available on income tax site. Just go to income tax site and file it by downloading excel file or you can directly file it by your login id on it.
I hope ans is clear to you
Regards
You cannot e-file the returns for FY 10-11 AY 11-12, the maximum time limit is one year from end of AY 11-12, Which was 31-03-13, so the site wont accept the return, since it is time barred. However, you may try filing a physical return in your ward, and enclose a letter, explaining why such a delay in filing the return. I think, in case the reason is genuine, they may accept your return.