The only place to get an I-551 visa stamp is in your passport. According to the U.S. Citizenship and Immigration Services, this stamp proves you are a legal U.S. resident and authorized to work. The stamp is temporary until you receive your I-551 card, or green card. As of July, 2010, the fee to file the paperwork to receive an I-551 visa stamp is $1,010. Once you mail the completed application and it's approved, you'll receive the I-551 stamp in your passport. The stamp is valid for one year after it's issued. You should receive your green card within a couple of months.
Complete the I-485 "Application to Register for Permanent Residence" or "Adjust Status" form. You can download the .pdf form from the U.S. Citizenship and Immigration Services' (USCIS) website at http://www.uscis.gov/USCIS/files/form/i-485.pdf.
Gather documents for the U.S. Citizenship and Immigration Services. You will need a valid passport, money order to cover application fees, marriage certificate, employment contract and any other family information.
Get two additional passport photos. You can get this done at a variety of retailers, including from your local post office. You will need to submit the photos with the I-485 application form.
Mail the I-485 application and all other documentation, including your passport, to the U.S. Citizenship and Immigration Services.
P.O. Box 805887
Chicago, IL 60680