After you have formed the ball you really need to pack it with a lot of strong ki. So keep making the ball more and more dense. When the ball is "thick" with ki you need to focus on your target and extend your aura (an energetic field that surrounds your body) out until it engulfs your target. Make sure not to lose your concentration on the ki ball or the electric feelings inside and out as you do this (this will be easier after the mental training). Be able to feel through your target. Now thrust your palms forward at the target and send the ball blasting at and through the target. As you do this you will need to use a specific type of Kiai (pronounced Key-ya literally spirit yell) that helps your issue powerful ki. Basically the shout is a very gutteral, drawn out "ehy!" that orginates in the hara. The shout should make your lower abdomen thrust out forcefully as you shout. With enough intent the shout itself can be used to stop an opponent in his tracks. So as you fire the blast an let out your Kiai you should feel the power from the blast, remember to blast through your target. Now the first few times you try this you won't get it - hell, it may take you a long time to get it right. To speed up this process and use less energy Mystery Shadow got the idea to use mental training. That is, to mentally rehearse the ki blast in your head over and over every day either in conjunction with or instead of actual ki blast training. Pretty much all you do is sit, close you eyes and mentally go over doing the technique from begining till end over and over again, while trying to make it as vivid and real as possible in your mind. This will make the technique easier to grasp and easier to do. Like I said this method is complicated but once you are able to do it it is very powerful. Keep practicing and you will get it. This technique should only be practiced on trees (you could seriously harm a training partner). You trees can absorb and use our energy easily they benefit form it so the is no negative karmic backlash. This technique is one that will end a fight if it connects, be careful.
