What version of Premiere Elements and on what computer operating system is it running?
Premiere Elements Editor does not accept CD discs in the burn to disc features of the program. And, there are typically limited burn to CD choices in the Elements Organizer. Are you working in the Premiere Elements Editor and not the Elements Organizer?
What do you want to do -
Burn to disc DVD-VIDEO standard or widescreen on DVD disc
Burn to disc AVCHD format on a DVD disc
Burn to disc Blu-ray disc format on a Blu-ray disc?
Where do you want to playback the disc from one of these burn to disc opportunities?
Have you gotten into the burn dialog of your program and found
a. In Burner Location - blank, nothing there
b. Status Media Not Preset
Please review and consider, supply more detail. If any questions or need clarification on any of the above, please ask.