Correction. I just tested this and ISIS (v5.7) does not appear to transfer the calibration fit coefficients to the dispersion window. Perhaps this is a bug introduced in a later version. You can still calibrate other spectra using the Balmer lines in the calibration image as explained at the end of the tutorial part 1 but if you want to use the predefined coefficients described in part 2, I think you would need to transfer them manually.
BTW the translation in some parts is not so good because Christian added some sections later which he translated
Cheers
Robin