Find the song in the library or in the folder of songs that you've bought. Click and hold down the mouse button, then while you're holding it down, move the mouse to the Ipod icon - the place you want to put them. Let go of the button when you're hovering over the place you want them. That should, in theory, drag them from one folder to another and copy them there. The other way to do it is to highlight the song, left click and choose "copy" and then highlight the folder where you want it, left click and choose "paste".