In order to perform a telepunch, make sure that you have your melee attack selected. Then, hold down the right mouse button, which will cause you to perform a basic melee attack when you come into contact with a foe. Finally, find your enemy and teleport -straight- at them. You won't teleport through them, but into them and if you're still holding the right mouse button, you will kick them a reasonable distance. Same as swoop punching but with a teleport which has the advantage of being faster and less noisy but does use up a LOT more ki... so use wisely.
As an aside, if you land a telepunch with a reasonable amount of ki left, you can add another punch (only 2 total) by teleporting after them and hitting them again with the right mouse button still held down.
PS - Are you new to English as a language too? Just curious.