The document provides instructions for using the FAST1 Sternal Intraosseous device to access the central vasculature through the sternum bone. The device can be used when peripheral IV access has failed or is inadequate. It inserts a needle cluster perpendicular to the sternum surface to penetrate the bone and provide equivalent access to a central line. Precautions are given for patient size and bone fractures. Instructions detail preparing the device, insertion at a perpendicular angle to the sternum, securing the device, initiating fluid flow, and addressing potential problems.