Editing an issue title
You can edit an issue's title. The change to the title is added to the issue's timeline.
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Navigate to the issue you want to edit.
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To the right of the issue title, click Edit.

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Type your new title.
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Click Save.
 
Editing an issue description
You can also make changes to the issue description. The edit history is available unless the author or a person with write access removes it. See Tracking changes in a comment.
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Navigate to the issue you want to edit.
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At the top right of the issue description, click .

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In the menu, click Edit.
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Type your changes to the issue description.
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Click Save.