USING SYSTEM UI TUNER ON MARSHMALLOW DEVICES

Using Android M aka android6.0? you can use system tuner to edit quick settings!

To enable the System UI Tuner, bring down your Quick Settings menu (swipe down from the top of your phone twice)  and tap and hold the settings button  for some seconds. When you let go you will be asked if you would like to enable System UI Tuner. Select yes and you'll see System UI Tuner at the end of your Settings list.

In System UI Tuner, tap Quick Settings and you'll see  your Quick Settings shade. You can add tiles (by pressing the + at the bottom), move the toggles around (tap and drag) or delete toggles (tap and drag to the bottom). Your changes will be reflected in the Quick Settings menu.