It's simple to edit a chapter's title. 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.
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Type a new title in the Title field
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Select the Check mark to the right of the Timecode field to save your changes
