I'm sure you understand what Telekinesis is supposed to do, but you clearly don't understand how it applies to the game since you're assuming you need to do something for it to work...
What Telekinesis really do is when you try to pick something up, you're doing it from distance instead of having to be directly on it. You have nothing to do, it just happens. You'll see a distinctive purple "laser" coming from your character while he/she picks things up. Telekinesis is only for objects, picking them up or moving them.
I hope this clears things up for you.
