It is not entirely clear to me what you mean.
Therefore I may be telling you "old news". In case I do, please don't shoot me.
A subrip (.srt) subtitle-file can be loaded manually after having loaded the video-file, by a right-click followed by selection of "Load subtitles" ...etc. (Most skins also have a button for this.)
However, if a subtitle-file is placed in the same folder as the movie-file and has the same name as the movie (except for the file-extension of course), you need not do so, as it will then load automatically (unless you've disabled subtitles under (rightclick >) Options > Preferences > Subtitles.
You could perhaps check if a file is correctly formatted by loading .srt file in a subtitle-utility like
Vladimir's SubSync. Just run it; click on [..]-button at the right of the "subtitle"-box and in the window then opening change filetype from "SAMI files *.smi" to "SubRip files (*.srt)" and browse to your subtitle to
Open it. Subsequently simply save it (change the filename to be sure).
You could perhaps also read
this post to which I would add that you can e.g. create Ini/Bsi files (with multiple language subs) using
HWMaker.
