If you have the need to change your personal information, such as your name, company name or you want to re-enter your serial number, simply hold down the Ctrl
key immediately after you double click the SmartSound icon. Continue to hold the control key until the program prompts you for that information. This should happen before the program opens, so if the program starts, you did not get to the control key quick enough and you should try again.
If you are using Sonicfire Pro version 5.5 or higher, you can click the Help menu and choose "Change Serial Number".