Seated Calf Raise:

Read all instructions on the seated calf raise machine before use. Generally, you position the height adjustment to allow full range of motion. Sit on the seat, Put your thighs under the pad, just barely above the top of your knees. Now your thighs are parallel with the floor. Keep your stomach tucked in, chest out and shoulders back for good form. Inhale.
Raise your heels, rising off the balls of your feet, keeping your legs bent.  When you've risen as high as you can, pause, squeeze your calf muscles and exhale. Return to the start and repeat for reps.
See movie showing the exercise:

Leg Exercises:
Barbell Calf Raise	Hack Squat	Romanian Dead Lift
Butt Blaster	Inner Hip Adduction	Seated Calf Raise
Donkey Calf Raise	Outer Hip Adduction	Seated Leg Curl
Dumbell Calf Raise	Leg Extentions	Side Lunge
Dumbell Lunge	Leg Press	Squat
Dumbell Romanian Dead Lift	Leg Press Calf Raise	Standing Calf Raise
Dumbell Squat	Lunge	Standing Leg Curl
Front Squat	Lying Leg Curl	Step Ups
Goose Step	Reverse Leg Curl