"Pulling off leg spin is one of the toughest skills in cricket. The most important thing is to spin the ball as hard as you can.
Take a look at the grip and try to replicate it with the ball in your hand. Ideally, you want to be looking at landing the ball around middle stump to the right hander, so the ball spins past the outside of the off stump. In your action, think about the alignment of your feet during your delivery stride. Both feet should be pointing towards middle stump.
On release try to drive all your weight towards your target. This will create good rotation in your hips which will allow you to put more spin on the ball."