How do you make my white skin dark?

Depends on what "it" is.

If you are talking about a tan, UV rays from the sun are what makes your skin darker. If you do not apply sun block the skin will just burn, and turn red when exposed to the UV rays for too long....

Use lemon juice, or talcum powder. Or just wrap yourself up and don't let any part of you see the sun. Bu the way I recomend the talcum powder.

milk makes us white and you can use suncream when going outside in the sun.

Depending on your genes, you can lose the amount of mellanin (skin pigmentation) over time due to a lack of Vitamin D which is what your body makes from the sunlight. Places like Iceland/Greenland I...