Houston, TX 77210-4651. If you are submitting a certified copy of the document, submit the complete certified copy and then attach a page stating your correction at the back.This toolkit for parents and guardians contains forms and instructions for legally changing the name of a child under 18. There is a specific kind of affidavit you need to complete and sign before a notary public to support your application for a change of name. For notaries commissioned or recommissioned on and after January 1, 2016, the seal must also contain the notary public's Secretary of State ID number. The following forms are available for downloading, printing and completing. The petition will need to be taken to a notary public to get stamped when you sign it. Step 3: Fill out the forms Both forms are pretty straight forward, just don't sign either one of them. File a petition to the Clerk's Office of the Superior Court of the county where you reside. Visit the Texas Department of Motor Vehicles or MyPlates websites to see a complete list of specialty plates that are available.