If you are filing for your spouse, he or she must complete and sign Form I-130A, Supplemental Information for. Where you file your Form I485 depends on your eligibility category.Review the information below to see where you should file your application. The initial step in the process involves filing the appropriate petition with the United States Citizenship and Immigration Services (USCIS). The first step involves the submission of Form I-130, also known as the "Petition for Alien Relative," to the U.S. Citizenship and Immigration Services (USCIS). Alert: Before sending your package to USCIS, make sure that all the forms you have completed are the current acceptable edition. Alert: Before sending your package to USCIS, make sure that all the forms you have completed are the current acceptable edition. You must file an I-130 form (Petition for Alien Relative) along with two passport-time pictures of the spouse and filled-out Form I-130A for the spouse. As the petitioner, you'll file Form I-130: Petition for Alien Relative. The immigrant spouse will need to submit to a medical examination and send the official forms from the results to USCIS.