Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Sorry to hear you’re having trouble.
Tap at the top of the screen and slide your finger down about an inch, this brings up the toolbar, there you should then see an icon that looks like a light bulb, which adjusts the backlighting levels,
note that this only applies 6th and 7th gen paperwhite. If you have an older kindle version or one that isn't actually a paperwhite model (just the basic kindle) then that doesn't have a backlight, and it can't have the brightness adjusted. You should have a contrast setting in the setup menu that may help however.
If you have any other questions, just let me know. Otherwise, please do remember to rate my service prior to logging off, hopefully I have earned an “excellent”. I also invite you to contact me directly with any future support needs at http://bit.ly/1gHgwli
Thank you, ***** ***** a good day,