I'm not quite clear on your question. How do you use them? You just do. How do you use them "properly"? Mmm, that's kind of a loaded question. I think it's safe to say that most of the time, most directors try to avoid them, though there are exceptions.
For documentaries, to be honest, I think it's usually just laziness, and/or, the editor has nothing to work with as a cutaway. However, I happen to know that one documentarian on this forum uses them intentionally, as a way of reminding the audience that what they're watching is edited.
In narrative work, God, there could be a million reasons to use them, I think you're only limited by your imagination. On a movie like "Crank", I think they're probably used to speed up the action, and keep the energy at a frantic pace. In my own movie, I'm using them on a couple occasion -- once, during a musical montage, but that doesn't really count. The other time, I've got a dude tossing and turning in bed, and every time he repositions himself, I use a jump cut. In both of my own personal examples, I guess it could be seen as a way of showing passage of time? I dunno. I can't really tell you exactly why I wanted to use it, but I wrote it as a jump-cut, shot it as such, and I like the way it looks in post.
So, I think the answer is that there is no answer. Only you can decide what's "proper" and what's not.