The first step to updating the legal name on your Florida Birth Certificate is to fill out the amendment form below. Original signature required - Please DO NOT Fax.Complete and Send to: Miami-Dade County Public Schools. The first step to updating the legal name and gender marker on your Florida Birth Certificate is to fill out the amendment form below. All of the forms listed below are in Adobe Acrobat PDF (PDF) format. INSTRUCTIONS FOR FILING AN ACTION FOR NAME CHANGE -. ADULT. ○ You need this packet if you are over 18 years old and seek to have the court change your name. You need this packet if the parents want the court to change the name of a child who is under the age of 18. Hospital or medical facility where the person named on the birth certificate was born. How Do I Make a Correction?