Set a goal of 10 turns in a given distance, then try to increase the number of turns in the same distance. Both skis should be actively guided through the turn, the radius should be tight and consistent. Complete or round out your turns so that your speed stays under control. Once you feel comfortable on the groomed runs try the same turn in some easier bumps. Make sure yours is well timed and functional.
Many people like to touch their pole on the top of the bump they wish to turn on.
Plant the pole, then turn around it. Most beginner mogul skiers turn on the top of the bump. It's the easiest place to pivot your skis, for here you can move to the troughs. Imagine there is a river flowing down the mogul field, the path you will take will be the route the water takes. You may want to do a mixture of tops and troughs, turning in a rhythmical fashion not allowing the terrain to dictate where you turn.