A link to the pattern would be better, Drops pattern are Norwegian and they use the term M.1 for the charts. M is short for the word for chart, mönster or something.
Basically you do exactly what it says - put 4 sts on the cable needle, let them flop to the back, knit 4 from the L needle, then knit the 4 sts from the cable needle. That's called C8B in US patterns, and it make the cable cross to the right. The other one, you put 4 sts on the cn and let them hang in front of your work, k 4 from the L needle and k4 from the cable needle. That's known as C8F and make the cable with a left twist.