This video tutorial shows how to do a 2 point wavelength calibration on the reference spectrum
http://astrosurf.com/vdesnoux/wink/calibspectrum_en.htm
(Do not crop the spectrum but use the zero order (entering 0 as the wavelength) and one of the H Balmer lines rather than two Balmer lines as shown there)
You can then use the zero order and the A/pixel dispersion (sampling) to calibrate any other spectrum using the 1 point calibration function. There is not a video tutorial of that but it is described on page 53 of the manual
http://astrosurf.com/vdesnoux/web/help.pdf
Cheers
Robin