Can you tell us the extension of your subtitles' files? Are they .SRT?
Usually subtitles are automatically loaded by BSplayer if they have the same name as the movie file. For example:
MyMovie.avi
MyMovie.srt
This only if the subtitles are not disabled in BSplayer preferences (
CTRL+P -> Subtitles -> x Subtitles disabled). So, if that option is selected, uncheck it.
Plus before subtitles option turn out from grey to active, a subtitle must be loaded, so if the previous steps didn't wrk, after you open the movie file load a subtitle (
CTRL+L or
right-click -> Load subtitles...)
