Direct answer
Edit subtitle text and timing cue by cue
The subtitle editor parses a subtitle track into individual cues so you can change each cue’s start time, end time and text in a structured table. The current editor exports SRT, making it suitable for small timing or wording corrections before delivery. It is not a frame-accurate video editor and does not preview against video; use it for explicit cue-level edits and verify the final timing in your target player.