First of all, you need to stand roughly 10 feet away from your partner. Here, you should also make sure that you are facing each other and that your feet are shoulder width apart, with knees slightly bent, and your hands up.
You can now place one hand on either side of the ball and hold it chest high. Here, you will have to make sure that you are using both your hands to hold the ball; this technique is basically called the ‘2 handed chest pass’, which means you should use both hands equally.
Many players will put their dominant hand behind the ball and their weaker hand on the side, which is completely wrong method for this pass.
The next step is to pass the ball to your partner. As you pass the ball, your partner will take a step forward with his/her dominant foot in order to get power. You will have to extend your arms completely as you pass the ball. As your arms come to full extension, you will be able to release the ball by flicking your wrists and rotating your hand, so that your thumbs now points to the ground. When you are finished with a good chest pass, your hands should be facing away from your body.
Now ask your partner to repeat the same trick and pass the ball back and forth, working on getting the proper fundamentals down. It will take time, but eventually you should get it. Once you know the fundamentals of the trick, you can start working on speed and power.