Follow these steps to edit a document:
In Jira, go to Projects
Make sure that you are on the right project
Click the Documents tab
Locate the document that you want to edit and click on its Edit option under the Actions menu. The Edit Document page will open.
NOTE The Edit action is available only if the user has Edit permission.Make the necessary changes and click Save. A message with the result of this action will pop up at the top of the page.
For documents of type File you can only edit the properties of your document and replace the file attached to the document. If you want to modify the content of the file attached to a document, you have to first download it locally on your computer, make the necessary changes locally with the appropriate program and then attach the new file to the document.