Receive the ball even with the toes of the plant foot (or a little in front).
Stiffen or relax the receiving foot so the ball stops about one step away (so you can quickly take one step & strike it; it is this step that gives power to the pass).
Be sure the receiving foot is 4" - 5" off the ground (if too low the ball will pop up) & contact the ball on the back part of foot (under the anklebone), not near the toes. Pull the toes up so the foot is parallel with the ground (not pointing downward). (If a player can't remember to raise his foot, have him practice by raising his foot higher than the ball & then bringing the foot down in front of the ball to stop it. This will help him to remember).
If you want the ball to go to the left or right (instead of straight in front) you must angle your foot & contact the ball more in front or behind, depending on whether you want it to go left or right.