[AUDIOGUY]

Not rocket science boys and girls... Best advice is to clean the surface.
Then take a match torn from a paper match book and sparingly apply the
paint with a smooth stroke.

Keep a paper towel nearby in case you dont like the first try. You can wipe
it clean and start again. White is a tough touch up color. It can be milky at times.
You may want to apply one coat and let it sit for a few hours and then come back with the money shot.

Obviously, make sure it is a scratch first. If your fingernail catches it then it is a scratch and requires paint. If not, try a compound.

Best of luck.