If your license plate frame is broken, you will need to replace it with a new one. You can purchase a license plate frame from your local auto parts store or online. Be sure to measure the width and height of your license plate before ordering a new frame. Most frames are made to fit standard sized plates, but there are also specialty frames for oversized or custom plates.
To install the new frame, simply remove the old frame and attach the new one in its place. Some frames come with screws and mounting hardware, while others require you to reuse the hardware from your old frame. Once the new frame is in place, tighten the screws or bolts until it is secure.