Open your video in a player like VLC Media Player or MPC-HC.
Ensure the subtitle file ( .srt ) has the exact same name as your video file (e.g., The.Shallows.2016.WEB-DL.x264-FGT.srt ). subtitle The.Shallows.2016.WEB-DL.x264-FGT
If it doesn't load automatically, simply drag and drop the .srt file onto the video window while it's playing. Open your video in a player like VLC Media Player or MPC-HC