This screencast assumes that you have already installed Infra Recorder
to your computer
and that you have already downloaded the Ubuntu CD image
from the Ubuntu website.
So to begin, open up Infra Recorder
and go to the actions menu.
From the actions menu, select Burn Image...
You will get an open file dialog here
and you want to select the Ubuntu CD image
that you downloaded before
and click on Open.
You will get this warning message if your CD burner
is also a DVD burner.
You do not want to burn to a DVD, so just click on No.
Click on OK to burn your CD.