According to my S&B 6x42 booklet one click will move the POI 10mm at 100metres or 2/5ths of an inch at 100 yards. The adjustment range is 210 cm @ 100metres, so you have 210 clicks of both vertical and horizontal adjustment across the range. If you take the turret caps off you will see a small window which shows where the reticle is in relation to the tube centre - depending on how old your scope is, it may be a simple black dot under a perspex(?) window. My most recent S&B purchase has a very natty coloured affair.
TBH there isn't much else to read, but if you want a copy PM me your email address