: When you attempt to start the burning process, a registration window will pop up asking for your licensed email address and the registration code (license key).

If you cannot pay, do not use cracked software. Use a completely free, open-source ISO tool instead. The best alternatives include:

Ensure your computer is connected to the internet, as the server must verify the registration online.

: An open-source tool that allows you to simply "drag and drop" ISO files onto a USB drive to make it bootable without formatting it every time. Warning on "Free" License Keys Download SYSGeeker WonderISO for Mac | MacUpdate

WonderISO was gone from her hard drive. But in its place was a new folder, untitled.

: Look for a "Register" or "Key" icon (usually in the top menu bar or bottom corner).