It's easy to edit a chapter's start time. To do so:
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Open the video
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Select Table of contents from the menu in the upper-right corner
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Select the chapter you want to edit. Once selected, an Edit icon (pencil) will appear to the right of the chapter's thumbnail. Select the Edit icon.
From here, you can edit the chapter's start time in one of two ways:
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Select the Timecode field
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Enter a new timecode into the field
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Select the Check mark to the right of the Timecode field to save your changes
OR
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Select the Timecode field
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On the video's Seek bar, move your cursor to the point in the video you want the chapter to start. The Timecode field will automatically update with the timecode matching your cursor's location.
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Select the Check mark to the right of the Timecode field to save your changes