• Open the hood of the Civic and remove the radiator.
• Undo the bolts securing the radiator support to the body of the Civic.
• Disconnect any other electrical wires or hoses that are connected to the radiator support.
• Gently remove the radiator support.
For a more detailed guide with images, refer to the following link:
https://www.civicforums.com/forums/11-civic-faq-how-to-guides/20057-diy-replacing-radiator-support-pics-included.html