Place the .srt file in the same folder as your video file.
To set up or use subtitles for on your 720p BluRay file, follow this guide to ensure they sync and display correctly. 1. Identify Your Subtitle Needs
Most modern players will automatically detect the subtitle if named correctly. Right-click the video while playing →right arrow Subtitle →right arrow Sub Track →right arrow select your file.
These provide text for every line of dialogue in the film. 2. Download and Add the File
If your BluRay rip didn't come with them, you can find them on major subtitle databases like OpenSubtitles or Subscene.