Edging and Pressure Application:
Nowadays, skis are designed as such that they are laid on their edges and so when you wish to turn pressure is applied and they turn. So basically all they need to make them turn is to move your ankles and feet in the direction you want your skis to turn. Thus by fluctuating the amount of pressure and edging applied on the skis, you can regulate the sharpness of the turn you take. The more the pressure and edging applied on the skis, the sharper the turn.
Turning your skis to a stop (picture 32C-f as reference):
This exercise will make you feel how easy it is to turn your skis just by rolling your ankles and feet.
Stand on an intermediate slope with your skis on a narrow traverse track. Your skis should be put apart and a bit edged (refer to picture 32C). Begin by traversing about the slope and pick up speed (refer to picture 32D). When you are prepared to make the turn, roll your ankles and feet up the hill while holding the edges of the skis rooted to the snow (refer to picture 32E). This way, the skis will turn up to the hill and stop (refer to picture 32F)
Do this exercise again but this time when you are rolling your ankles and feet, you should count till three before you return them to their actual traverse position and then slide them again. Again you should roll them up to the hill.
Note: you shouldn’t try turning the skis by twisting your feet in the course of the turn. You should try and ride the edges of your skis when they turn. Also remember that it is that shape of the skis which makes them turn when they are put on their edges.