The ones that come with the kit are Dry Transfer decals, and Stickers.
If you are going to paint it, throw the stickers away, there crap.
For the other ones, you put them on so that you can read them, you tape them to the piece so they are on tight, and flat. You rub them with something, like an eracer, or a coin, or your thumb nail, anything to cause the decal to stick to the kit. Remember to tape it and make sure its secure
IF you need a pic there is one in the manual about it.
When I get home Ill scan the page and link it to you so you can see.