If you have a particular style of font that you want to use but can't find one that looks right in iMovie, it is possible to download one. Go to www.dafont.com or search for font websites on Google. Once you have found the right font and downloaded it, it should instal to the computer automatically. But you will need to restart iMovie before the new font is loaded into iMovie. This means you just have to save your work, quit iMovie and then open your project again. Once you have done this the new font should be installed in iMovie.