How to Change Symbol Position Horizontally and Vertically with Actionscript

you would change the symbol's x and y properties using the symbol's instance name.  for example, if mc1 is at 0,0 and you want to change that to 100,200:

mc1.x = 100;

mc1.y = 200;

if you want to animate the position change, you would use a loop (eg, enterframe) to repeatedly update the x and y properties:

this.addEventListener(Event.ENTERFRAME, loopF);

function loopF(e:Event):void{

if(mc1.x<100){

mc1.x += 2;  // different values from 2 would change the speed.

}

if(mc1.y<200){

mc1.y += 2;

}

// done animate this move, terminate loop

if(mc1.x>=100 && mc1.y>=200){

this.removeEventListener(Event.ENTERFRAME, loopF);

}

}