To add a title or credit
1. On the Tools menu, click Titles and Credits.
–or-
In the Movie Tasks pane, under Edit Movie, click Make titles or credits.
2. On the Where do you want to add a title? page, click one of the links depending on where you want to add the title.
3. In the Enter Text for Title page, type the text you want to appear as the title.
4. Click Change the title animation, and then on the Choose the Title Animation page, select a title animation from the list.
5. Click Change the text font and color, and then on the Select Title Font and Color page, choose the font, font color, formatting, background color, transparency, font size, and position of the title.
6. Click Done, add title to movie to add the title to your movie.
if you are making scrolling titles, you can't place subtitle at any desired place, there are only 3 options, Left, Center, Right. To make more flexible subtitle, try Wondershare Movie Story, you could place scrolling titles anywhere and with animated effect.
http://www.ourpix.com/downloads/dvd-slide-show.html?page=125
hope that helps