What are the steps to getting my ex husband off my daughter's birth certicate? And where do I go to to have it legally changed? Is there any costs?

Would I need an attorney to get my ex husband to sign off my daughter's birth certificate? Where would I go to have her last name changed? Is there any costs? Just a note my ex husband is a convicted felon. And needs to stay away from little kids. He is also violent. Also, if I need an attorney what type would I need? Thank you