There are many steps in the process of applying but the first step is for your U.S. relative to file an I-130, Petition for Alien Relative form, with USCIS, including proof of status as a U.S. citizen or permanent resident, and relationship to you. Your U.S. relative will be notified once the petition is approved, and the petition will be forwarded to the National Visa Center. When a visa becomes available to you, your U.S. relative will be asked to file an Affidavit of Support, USCIS Form I-864, and pay the applicable fees, after which you will receive instructions from the Department of State regarding filing your application for an immigrant visa, your interview at the U.S. embassy or consulate in your country, required documentation, etc.