How can i change my daughters last name to her father's and add him on her birth certificate

You might have to go through the court channels to put the father on birth certificate. But before you proceed you should consult with a lawyer the pros and cons of such actions as there are many to take into consideration. Feel free to contact my office. Above answer and comments to questions are for general purposes only and does not constitute legal advice or establishes an attorney-client relationship without a signed retainer. Please reach out to an attorney you are comfortable with working and discussing your case in more details. If you can not afford a private attorney, you may be eligible for a Pro Bono lawyer provided by some courts and if not, feel free to ask about our affordable payment plans.