YoTricks.com

The first thing that your going to want to do when you get your yoyo out of its package, even before you put it on your finger, is adjust the string for your height. All that you need to do this is, of course, your yoyo and a pair of scissors.
So, take your yoyo, and you want to drop it so that it’s just barely not touching the ground. You want to find where the string meets with your belly button, and just kinda hold it right there. Now grab your scissors, and you want to cut the string right where you made that mark. Next, take the top of the string and you want to fold it over, and your gonna take these two strings and treat them as one… just wrap it over your finger, that will create a little loop, and you’re gonna take the top of the string and just feed it right through that loop. And what this will do is create the same type of loop that your yoyo had when you bought it.
Now this loop may be too large or too small for your finger, and so, what we’re gonna do, is take this bottom string and feed it right through that loop. What you’ll find when we do this, is it will make another loop that’s adjustable, so that no matter how large or how small your finger is, it will fit. So, where you want to put it is on the middle finger of your dominate hand and I usually place it between my first and my second knuckle, tighten it down.
Now we’re ready to learn to wind the yoyo.