no one can really help you here man there's gonna be a specific sequence of buttons you have to press or somethin on whatever individual scale you have to reach the calibrating mode. at that point in general you need to place a 100.00 gram weight on it so the scale's computer can figure out what numbers to show for certain weight and by providing a known weight it can figure this out.. For mine I had to like hold the power button and then hit the tare at the same time to get into calibrating mode but that's just mine

Stay high