To be safe, just type it in exactly as the instruction say. If Sound Forge is not loading, check the ExePath value. That must be the exact full path to your Sound Forge Program. Mine is:
C:\Program Files (x86)\Sony\SoundForge Pro 10.0\Forge100.exe
but yours could be different, if you have a Sound Forge icon on your desktop, you can right-click on it, bring up the properties. The path will be in the Target entry. You can copy and paste that (without the quote marks if there are any) into the registry ExePath value.
Edit: changed my comment about case and whitespace. The best thing to do is follow the instructions without deviation.