you can get a pen, and jar (kinda like a nail polish bottle with a brush), and aresol can or buy it in pints.
I got the touch up pens and it wasn't enough. If I went with the 2 oz. jars, it would have been perfect.
just beware that you might need 3 colors just to match your paint...you will most likely need a base color, a top color and then the clearcoat.
To be honest if your scratches are really small, I wouldn't worry about touching them up. In my experience when you touch up really tiny scratches it can sometimes make it worse since the touchup paint is never "flush" with the rest of the paint, but if your careful you might be ok.
If you have pretty noticible scratches, then it might be a good investment.
There is a application on their website to help you. And there customer service seemed excellent.