if you want to turn the subs on and off, used "forced only".
then, while the movie plays, hold the "selelct" button on the remote until a menu appears. from there you can select the subtitle language (if more than one is available) or turn it off.
That will only burn in subtitles that have been marked "forced"... i.e. subtitles during foreign language parts.
Try clicking on select with remote when movie is playing, all you get is "chapter" selection.
How do you rip the subtitle out of the dvd and into an .srt file?