Apple iDVD 6 - Manual (Page 21)

Chapter 2 iDVD Tutorial 21
As you click colors, the text on the menu changes to the color you selected. When you
find a color you want to use, close the Colors window.
If you don’t like your changes and want to start over, click Reset Text.
6 Click outside the text area to deselect the subtitle, then drag it into position below the
title. If you need to reposition the main title to fit the subtitle below it, drag the title
text.
The menu below shows the new title and subtitle.
Title
Subtitle