The way I do it is I turn my palm up and (If you’re right handed) make sure the string goes off of your hand to the right, then tug the yoyo upward to give it some slack and turn your hand over so it faces palm down at the same time as pulling it to the left a bit, creating a semicircular movement with your hand.
Jensen uses a different method in this video, but it’s what I learned from: https://www.youtube.com/watch?v=GENUE7gkDf0