Getting or replacing a citizenship certificate

• I’ve lost my citizenship card/certificate. How do I replace it?
• What documents should I send with my application for a citizenship certificate (proof of citizenship)?
• Can I replace my citizenship certificate or card if there’s a mistake on it?
• How do I get a citizenship certificate (proof of citizenship) for someone under 18 years old?
• I legally changed my name. How do I change the name on my citizenship certificate or card?