hi , how are you all guys , i hope you all fine

first : sorry because iam asking alot in this forum

here is the problem

i made a game and i know how to move the hero left up etc..

also i know how to change his speed

but ..

i dont know how to change hi speed when i use electrical shield speel

i tried with variables vs and vx without anything

what i mean that i want to change hero speed without change his postion

like wen you use this spell  electrical shield his speed will improve

for example when you move  left or right , your speed 3 or 4 px per frame , but when you use this spell and moves the hero to the left or right  his speed should be 30

here is the hero class

package  {

import flash.display.MovieClip;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;
import flash.events.Event;
import flash.sensors.Accelerometer;

public class HERO extends MovieClip {
   var ELECTRICALSHIELD:electricalshield  = new electricalshield
  var vx:int
  var vs:int
 
  public function HERO() {
   addEventListener(Event.ADDED_TO_STAGE,onAddedToStage)
  
  }
  public function onAddedToStage(event:Event):void
  {
addEventListener(Event.ENTER_FRAME,onEnterFrame )
stage.addEventListener(KeyboardEvent.KEY_DOWN,onKeyDown)
   stage.addEventListener(KeyboardEvent.KEY_UP,onKeyUp)
   addEventListener(Event.REMOVED_FROM_STAGE,onRemovedFromStage)
   gotoAndStop(4)
  
  
  

}
public function onRemovedFromStage(event:Event):void{
removeEventListener(Event.ADDED_TO_STAGE,onAddedToStage)
removeEventListener (Event.ENTER_FRAME,onEnterFrame )
   removeEventListener(Event.REMOVED_FROM_STAGE,onRemovedFromStage)
   trace("player removed")
}
public function onEnterFrame(event:Event):void{

x += vx
}
public function onKeyDown(event:KeyboardEvent):void{

if (event.keyCode == Keyboard.RIGHT){
gotoAndStop(2)
vx += 1
vs = 10
vx *= vs

}

if (event.keyCode == Keyboard.LEFT){
  gotoAndStop(1)
  vx -= 1
  vs = 10
  vx *= vs
 
}
if (event.keyCode == Keyboard.UP){
  gotoAndStop(1)
  y = 10
}
if(event.keyCode == Keyboard.Q  ){
  vs = 30
addChild(ELECTRICALSHIELD)

}
}

public function onKeyUp (event:KeyboardEvent):void{
if(event.keyCode == Keyboard.Q ){
if(ELECTRICALSHIELD.stage){
removeChild(ELECTRICALSHIELD)
vx = 0
}
}
if(event.keyCode == Keyboard.LEFT){
    vx =0
gotoAndStop(3)
}
else if (event.keyCode == Keyboard.RIGHT){
   vx = 0
   gotoAndStop(4)
}
}
}
}

thank you again for watching my discuss