What can i use white eyeliner for? And where can i apply it? Details please! :)

You can put it in the waterline of under your eyes (after making sure they eyeliner is clean) and then put black eyeliner underneath the white eyeliner, lightly, and apply more on the lash line of the top lid. Your eyes will probably look larger. Include mascara ;)

You can put it in the inner corner of you eyes (if it's creamy) and blend it. It will make your eyes look awake and bright.

You can use it on your top eyelid on the lashline and use some light eyeshadow too.

You can use it under your eyes for the mod look than apply black eyeliner on top of your eyelids.