Ok incase you can see a transparent background, using your selection tool, draw either a rectangle, square or circle around the object on the .png image that you want on your LO.
You can move the selection (marching ants) with your left or right mouse button. They changed which one does it...but it works in PSP6, so click inside your marching ants and hold while moving your mouse to postiion your selected area where you want it.
When you have it there, go to copy and then make your LO image the active image and then do Paste as New layer. Now your element will be on a layer of it's own so you can move it around where you want it!
hth's if not let me know!
