1) Bend your knees more. I'm sure you think you are bending them enough, but bend them more.
2) Put your shoulders into it, make sure you shoulders are paralell with the board when it goes to turn, most people actually fight toe turns with their upper body.
3) Crank your forward knee, almost act like you are trying to move your front foot inward( it wont actually move inward due to bindings).
4) think of your weight distribution at all times, when heelside turning your weight should be slightly over the heel edge, toeside make sure you put your weight slightly over the toe edge.
These are my basic tips for any new rider. Mostly just have fun