How to use Tile Settings in Dark Mode for Apps?

First step for unlock quick settings tile is click on unlock shortcut.

Now, You can see that Watch Video Ad (Button). But button is disable yet.Wait for some seconds. so video ad is loaded. when video ad is loaded button is enabled. after that click on it and watch complete video. When you watch complete video Quick settings tile is enabled.

After Watching complete video ad. Swipe downlaod, You can see below screen.Click on expand menu which shown in below screenshot.

You can see the red circle which shown in below screenhot. Just drag it on above side and then place it where ever you want.