Honestly did you really even look at the settings? I can't imagine how you could possibly miss them. Subtitle settings are normally under Display or Audio and in this case under Display. It's not like you had to scroll way down or anything either >_>
For those who don't get how that's possible, it's quite simple: the settings menu is very small relatively speaking, so it looks as though all of the options are displayed--you can't see the subtitle options without scrolling down.
"...Blame this on the misfortune of your birth." -Char Aznable