File the paperwork after you become a US citizen. Visit the USCIS website http://www.uscis.gov/portal/site/uscis or call the following number, they will guide you. YOU DO NOT HAVE TO SPEND MONEY ON LAWYERS WHILE FILING THESE PAPERWORKS. The whole process is real easy and you can do it yourself with out any problems.
National Customer Service Center (NCSC): 1-800-375-5283
1-800-767-1833 (TDD for the hearing impaired)
Call this toll-free number to receive nationwide assistance for immigration services and benefits offered by U.S. Citizenship and Immigration Services (USCIS). If you are outside the United States, contact your local embassy or consulate. See link to the right for US Department of State.