Off-spin is the most popular method of spin in cricket.
An off-break delivery turns from the off side to the leg side when bowled at a right-handed batsman.
The spin is generated by the first and second fingers of the right hand.
The more revolutions you can put on the ball, the better chance you have of getting more turn when the ball pitches.
The middle joints of the index and middle fingers are well spread across the seam. The ball rests against the third finger but the thumb has little involvement.
Turning the wrist and the index finger generate the spin on the ball, turning the ball in a clockwise direction.
Use your first two fingers to give the ball a good "rip" at the point of delivery.