When you select any Advice Option or Advice Reason in a step of a section you'll notice that a pencil (edit) icon will appear to the right of the selected option / reason. If you click on the edit icon you'll be taken to a new screen where you can then edit that Advice Option / Reason for that report.

 You can only make a permanent edit to an Advice Option or Advice Reason belonging to you or an organisation to which you belong (subject to the necessary permissions). You can do this via your Advice Options & Reasons Library.