Keep both the video and the subtitle file in the same folder.

You can typically find the matching subtitle file on these major platforms by searching for the exact filename:

Make sure the subtitle file has the exact same name as your video file (e.g., The.Finest.Hours.2016.1080p.BluRay.x264.srt ).

Subtitles tagged with "1080p.BluRay.x264" (like those from groups such as SPARKS, AMIABLE, or ROVERS) are generally interchangeable because they share the same frame rate (usually 23.976 fps) and start time.

If it doesn't auto-play, simply drag and drop the .srt file onto the video window while it's playing in VLC or a similar player.