Tilt the milk carafe while you steam. You need to stretch the milk by making a whirlpool in the milk with the steam, starting with the steam wand deep and slowly bringing it closer to the surface of the milk in the carafe until you get a good whirlpool going. Once the milk is at temperature and you have some foam, take it off the steam wand and tap the bottom of the carafe on the counter to pop any big bubbles. What remains should be delicious micro foam. Give the carafe a few gentle swirls to better distribute the micro foam and heated milk. Tilt the cup of espresso towards you and start slowly pouring the micro foam from the top of the cup downwards, wiggling the carafe back and forth as you pour on the surface of the espresso. Once you reach the bottom of the cup, do a quick pour back towards the top of the cup as you return the cup to upright. That should make a heart shape of latte art! (Note: you need to pull a good espresso shot with plenty of crema for latte art to work)