You can edit an estimate by changing the introduction, body, budgets/costs, prices etc. These can be edited when viewing the estimate.
How to edit an estimate:
Search for the estimate you'd like to edit, and click 'View' next to the estimate you would like to edit.
You will then see a page with all of the details of your estimate.
Click 'Edit' in the top right of the screen to edit the date, description, or the notes for the engineer.
Use the navigation on the left of the screen to see each section of the estimate. Change the fields as required.