How to make a back button?

The array will be a list of your steps

define the array:

var myBackList:Array=new Array();

now every time it you change to another frame, add to the list (array) the label name of the frame

i.e.

myButtonGoToFirstSection.addEventListener(MouseEvent.CLICK, gotoFirstSection)

function gotoFirstSection(e:MouseEvent):void{

         gotoAndStop("FirstSeccion")

          myBackList.push("FirstSeccion") //this add the the label to the array

}

then the code to the back button is:

myBackButton.addEventListener(MouseEvent.CLICK, goBack)

function goBack(e:MouseEvent):void{

          gotoAndStop(myBackList.pop())

}