If the gas tank fell onto the driveshaft on a 2006 ridge line how can u fix it

Hello, basically you need to ensure the fuel tank is safe - not contacting anything and not leaking or at risk of leaking. If it's not damaged to the point of leakage or risk of leaking, and it's not currently contacting any other component -- you should be able to secure the fuel tank with the mountings that are designed to hold the tank. If they are fractured, you'll need to acquire new attachments from your Honda dealership, if available. Have the vehicle checked for safety first, and replace the tank if it's damaged to the point of leakage or the risk of leakage.