After making a nice slideshow with music, there does not seem to be a way to export the file to burn on a DVD.
Why is that? How can this be done without buying expensive software to do what iMovie should do in the first place?
iPhone 4, iOS 6.0.1, apple not discovering headset
Why is there no iDVD on my new Mac? How do I get it and how do I install it?
https://discussions.apple.com/docs/DOC-3673
To burn a DVD with iDVD from the latest version of iMovie, you have to export the movie using the Export button and select 480p as the size. Open iDVD and start a new project, then drag that exported movie file into the iDVD menu window, avoiding any drop zones you see.
If you are using iDVD with El Capitan or Sierra see this thread:
how to make iMovie slideshow and burn to dvd?
