just a tipp... less Exclamation marks and an explanation of your problem in the topic and you will probably get some help here.

I think he wants to be able to draw a scribble or whatever on the screen, and then switch to a mode where he can pick it up with the mouse and move it around.

This isn't conceptually difficult, but if you're new to processing is going to require you to learn some stuff first.  What you're going to want to do is write some code to let the user draw.  There's plenty of examples of how to do that here in the forums and (better) in the "learning" section of this website.  You'll do the same, or steal that code, but change it so that you're drawing into a PGraphics object that you've created, rather than directly to the screen.  Initialize your PGraphics object by filling it with completely transparent white (or black, or mauve, so long as it specifies complete transparency in the alpha channel).

When the user is done drawing, you can analyze the contents of the PGraphics object to find the bounding box of the user's drawing, and then use PGraphics.get() to take a rectangular "slice" out of that PGraphics object.  Store that in a separate PGraphics object.  It is now a "sprite" that you can draw to the screen wherever you want.

If you've gotten that far, it will probably be clear to you how to use further mouse input to control the location at which you draw the sprite to the screen, so that's how you'll be able to pick up the drawing and move it around.

As i dont know what your program should be able to do I put togther some things you will need...

Like cloister suggested we use a pgraphic to draw in...
you can draw while pressing the mouse button. If you switch to dragging mode by pressing space. You can now drag ( bad dragging, you have to work on that) the image arround...
by pressing X you delete your image and start from scratch.
It just shows the idea of using a Pgraphic Object but you have to work on that. for example if you want to continue drawing or if you want more objects and so one... like i said, dont know what your programm should be able to do, but maybe thats a good start...





float posX;
float posY;

PGraphics pg;
boolean drawing = true;
void setup(){
 size( 400, 400 );
 imageMode(CENTER);
 pg = createGraphics(400,400, P2D);
posX = width/2;
posY = height/2;

}  


void draw(){
 background(255);
 pg.beginDraw();


 // pg.background(255);
 if(drawing==true){
    cursor(ARROW);
   if (mousePressed == true) {
     pg.fill(0);
     pg.ellipse(mouseX,mouseY,10,10);
     pg.endDraw();

   }
 }
 else{
   cursor(HAND);
   if (mousePressed == true) {
     background(255);
     posX = mouseX;
     posY = mouseY;      
     //image(pg,mouseX,mouseY,width,height);
   }
 }
println(posX);
 image(pg,posX,posY,width,height);

}  

void keyPressed() {
  if (key == ' ') {
  if(drawing)  drawing=false;
 else  drawing=true;
}

  if (key == 'x' || key == 'X') {
  pg.background(255);
  posX = width/2;
  posX = height/2;
  pg.endDraw();
  }

}