This form should be used when an adult wants the court to change his or her name. How to fill out a general affidavit form.Completely fill out all three (3) Diligent Search Letters (Form B) with your information, the other party's information and have them NOTARIZED. The first step to updating the legal name on your Florida Birth Certificate is to fill out the amendment form below. If a person is helping you fill out your change of name request, that person must complete a Disclosure From Nonlawyer (Form 12.900A) form before assisting you. Verify statements for legal matters and business transactions using our Florida general affidavit form template. The first step to updating the legal name and gender marker on your Florida Birth Certificate is to fill out the amendment form below. C) Petition for Change of Name (Minor Children), Form 12.982(c). D) Report of Legal Name Change, DH 427 – complete only the sections as indicated in the SAMPLE. Name Change Affidavit in Compliance with Section 68.07(3)(i), PDF.