You do not need permission of the federal government to marry your girlfriend. Just go to the county clerk, apply for a marriage license, and get married. After the marriage, your wife can remain on an F1 visa so long as she remains a student and does not accept employment without USCIS authorization. When you are ready, you can apply for a green card for her (Forms I-130, I-485, I-864, I-765, and I-131 are online, along with instructions, at uscis.gov/forms). If you file for a green card after you were married for 2 years, the procedure will be simpler and less expensive because. Remember that, if your own income is less than the federal poverty level, you will have to find a co-sponsor who would file a second affidavit of support.
Answered on Nov 12th, 2013 at 11:07 PM