Problems with drag and drop

1

i went through the tutorial of drag and drop on this site and then tried to use it using an imported image and change the scripting , i converted the bowling ball image to a symbol as a movie clip and a button just like in the tutorial, i even gave them the same names as in the tutorial, but stop the coding and closed it before the computer part. the symbol doesn’t move! is this because I haven’t converted the bitmap properly or should I be doing something different with the _root.yellow coding? i cant figure it out, I checked the syntax and its all correct