This option allows you to modify the details of Expressions created in all public folders, shared folders to which you are mapped and private folders for which you are the owner. Additionally, the Write role should be mapped to your user group.
You can Modify the Expression details as required in the Edit - Expression screen.
Select the checkbox adjacent to the Expression Name whose details are to be updated.
Click 
button and
the Edit - Expression screen
is displayed. Modify the required changes. For more information refer
Add Expression Definition.
Click Save to save the changes.