Hi, I was on F1 OPT status for 2011 and worked as a freelancer and have a 1099-misc form. I do not know how to file for tax returns on this form. Any help is appreciated.

You DO know that doing free-lance work while under a F-1 visa VIOLATES the provisions of your visa? Thought that is a relevant comment to make.

You will file Form 1040NR with Schedule C and Form 8843 to report the Form 1099-MISC income.