To turn fliff coins into fliff cash, you can visit the official Fliff website and log into your account. Once logged in, navigate to the Convert section where you can exchange your fliff coins for fliff cash. Follow the on-screen instructions to complete the conversion process smoothly. Ensure you have sufficient fliff coins for the exchange and review the conversion rate before proceeding. After the conversion is successful, you can use your fliff cash for various in-app purchases or transactions.