Anyone knows how to use the waving extensions?

I bought a hair extension on line, as my sister always say that I just have a little hair, and so that I can't get beautiful hairstyle with so little hair.
But when I got the extension, then I found I don't know how to use it at all.
I bought the extension here: http://www.abhair.com/product/18-silky-straight-weave-top-quality-remy-hair-extensions
It's not cheap, so I don't think I can just leave it there, and buy something else.
Anyone know about this kind of waving extensions? Any idea about it?