Press [D] (new configuration - [A]) to perform a shot on target. The longer you hold the button, the stronger the shot will be. Of, course, if you're far from rival's goal, more power is necessary. Note, that the ball flies high after a strong shot, so there is a possibility of a miss, even if the shooter is standing a few meters from the goal.
If rival goalkeeper often performs charges, try to kick the ball over him. This can be done by pressing [Q] + [D] (or [Q] + [A], if new configuration is in use).