How do I change the placement of titles in Movie Maker??

I am adding subtitles to a video I imported into Movie Maker. Currently the
titles appear in the middle of the screen. I can change if they're placed to
the right, left or centered, but still in the middle of the screen. I want
them at the BOTTOM of the screen, like subtitles in foreign movies. How do I
do it?? Thanks in advance.