hi j hamster. ok. here is what you'll want to do.
make a movie clip with an instance name of 'popuptext'(i suggest making this box's alpha value between 50%-75% to make it look more professional.)
next, you'll want to add a button in 'popuptext' that will close it.(i suggest an X or 'close' or whatever.)
ok. in 'popuptext', write this(or copy.)
this._visible = false;
in the button that will make the textbox appear-
_root.popuptext._visible = true;
in the button that will close the textbox-
_root.popuptext._visible = false;
are there easier ways of doing this? of course. but this gets the job done atleast.