stick sticks in air, like magic ;)
You start with the cross (see prerequisite).
Then, you send the diabolo up, you put your sticks horizontal, and the diabolo should fall on the 2 upper strings, but not touching the bottom stick.
Then, just take with your fingers (both side) the string which goes to the diabolo.
and let your stick free, holding everything just with the string in your fingers. Sticks are verticaly hold by the string you hold in your 2 fingers.