To use an emergency stop button on a building hoist, first, ensure you are familiar with the hoist's controls and safety features. Locate the emergency stop button, which is typically a red mushroom-shaped button or switch, prominently placed and easily accessible. In an emergency, press and hold the button firmly. This action will immediately stop all hoist functions, including movement and operation. After pressing the emergency stop, evacuate the area if necessary and notify the appropriate personnel to address the situation. Remember, the emergency stop should only be used in situations where immediate action is required to prevent harm or damage. Regular training and drills can help ensure you are prepared to use the emergency stop button correctly and effectively.