Hi skoville , I see you figured it out before I saw this thread.
Just to go over it.
After you create the .cue file.
Using Write mode ( "Write image file to disc" if using Ez-Mode Picker).
"Browse for a file" the select the .cue file.
Burn to a CD disc for an Audio CD.
The ImgBurn guide or tutorial for this is old but still works.
Unless this has changed ImgBurn needs one of the FLAC codecs installed on the OS to do this.