Welcome to the forums. It should be in the quick settings panel, swipe down from the status bar using two fingers to open it. If it's not there swipe the panel up or to the left to get more options.
The Droid Maxx, which never went past KitKat 4.4.4, does not have a flashlight built in. You'll have to install a third party app from the Play Store to get a flashlight.