On finale notepad 2008 how do you change the key signature?

If you want to change the key signature of the whole song, simply to go the main tool palette and click on the Key Signature Tool button. If the palette is not visible, go to Window -> Main Tool Palette to make it appear. Then you can use the dialog window to change the key. However, Finale Notepad is not able to change key signatures in the middle of the song. You can only have one key per song. Same with time signatures.