For the calibration, when using analogue load cells, it is under menu "scale". "Capture Zero", "Capture Span" and "Step calibration" might be using with known weights. It seams that you must be logged with an administrator account. The procedure seams to be quite the same that for IND560 for example. A video can be found at https://www.youtube.com/watch?v=ktpXuZk7j2A. I do not have done this with a IND780 yet, but you may try if it works.