You can paint them on or use decals.
If you paint them scuff the surface with fine scotch brite, outline them with 1/8 fine line tape then finish with 3/4 to one inch tape. Spray the color then pull the tape while it's still a little wet. Then finish up with clear over the entire scuffed area.

If you decide to use decals like the ones Chrysler has. Clean the surface well put one or two drops of joy dish washing liquid to a quart of water, spray the surface and the decal, position the decal and squeege out all the water. If there are any small air bubbles you can use a needle.
If you need to stretch the decal use a hair drier but be carefull.

Good luck