Make a triangle with the string and swing the yo-yo in it.
1. Sleep and touch your palm to the string like this.
2. Pull the string down and pinch it just above the yo-yo.
3. Guide the string down with your palm open and swing the yo-yo like this.
4. Catch after it swings 5 times or more.
First, try practicing without sleeping.
Open your palm wide to make a big triangle.