How do I access Quick Settings?

With the screen on, access the "Quick Settings" menu by swiping  the screen from top to bottom. Swipe down once more to display more icons from the Quick Settings menu.

Note: you can also edit the display and ordering of the Quick Settings menu. Simply tap on the pencil icon in the lower-right corner (when Quick Settings is expanded) to drag and drop icons. Furthermore, scroll to the bottom to add hidden icons to the top by drag and drop, or remove active icons to the bottom to keep them hidden.