Be facing the cable machine and assume a strong lifting position:
Core and glutes activated
Chest up and shoulders back
Knees slightly bent
Eyes fixed ahead.
With an overhand grip, grab the attachment just inside shoulder-width.
Rest the attachment on the upper part of your thighs with arms relaxed and elbows slightly flexed.
Vertically pull the attachment by focusing on activating your delts.
Your arms are a lever for your delts. Don't use momentum or other musculature to complete the exercise.
Don't shrug your shoulders, keep your strong posture.
Raise the weight to your collarbone.
Lower the weight to the starting stance.
Don't drop the weight from the top, control the descent.
You want tension on the cable at all times.
*Tips*
Ignore the notion of bringing the attachment past your collarbone.
Focus on keeping the tension on your delts throughout the range-of-motion.
Maintain a strong posture, not letting your shoulders slump forward.
If your shoulders slump forward and you are trying to raise the attachment vertically, this can place your shoulder in a compromised position, potentially leading to injury down the road.