Customize Quick Menu on HTC One M8

The menu you can either access by swiping down with one finger and click the button for it in the up right hand corner or simply swipe down with two fingers and get direct access to it.

Then to edit you just press the Edit button (the one with a pen) and simply drag around the icons in the way you want them.

You can have up to 12 active icons, simply drag the ones you want visible from Hidden and vice versa.