From google answers:
- To find your first few settings, swipe down from the top of your screen.
- To find all your Quick Settings, swipe down again.
- From the top of your screen, swipe down twice.
- At the bottom left, tap Edit ✏.
- Touch and hold the setting.
- Drag the setting to where you want it.
- To add a setting, drag it up from "Hold and drag to add tiles."
- To remove a setting, drag it down to "Drag here to remove."
For a visual demo: