Q: Waveburner asks for serial number before it will open

I run Logic Pro X on my MacMini with no problems, but when I want to use Waveburner to master and to burn CDs it presents a box asking for a serial number, which I don't have as I bought my MiniMac new with all software pre-installed and since then perform regular updates online, so I have no idea where to find the serial number for my installation of Waveburner. Could anyone help with this problem please?