Rename your subtitle file to match your movie file exactly (e.g., Slumber.Party.Massacre.III.1990.srt ) so your media player loads it automatically. How do I turn on subtitles? - Dude Bro Party Massacre III
.srt (SubRip) is the most widely supported.
Matching subtitles depends entirely on the specific edit of the film you have. The "UNRATED" tag often refers to one of three main versions: