The first step to updating the legal name and gender marker on your Florida Birth Certificate is to fill out the amendment form below. 1) Complete only the upper half of the affidavit.This affidavit will be linked to the original birth certificate thus becoming part of the birth record. The first step to updating the legal name on your Florida Birth Certificate is to fill out the amendment form below. 1. Complete only the upper half of the affidavit. This affidavit will be attached to the original birth certificate thus becoming part of the birth record. Please provide all information so that the certificate prepared will be complete. The forms listed below are to be used to modify a birth record. These forms cannot be used to modify an individual's birth record due to an adoption. When requesting any correction to the name of the registrant, both parents must sign the affidavit if both parents are named on the birth record.