How to use the editor
Open an SRT file, edit the time fields (format hh:mm:ss,mmm) and the text. Exported files use a blank line between cues, as required by SubRip.
Search
Search matches cue text and the displayed timecodes. Use Previous/Next to jump between highlighted matches. Turn on the filter to focus on long subtitle lists.
More on the format and workflow: How to edit SRT subtitles.