To edit the existing environment variable:
Navigate to the Environment Variable menu through one of the following ways:
From the Expand Menu, click Project Management > Configure > Project Configuration
From the Expand menu, click Settings > Project Configuration
Click the Environment Variable menu present in the left pane.
Now, double-click on the Active Value textbox to edit the field (the Global Value textbox cannot be edited).
Enter a new value for the environment variable in the Active Value textbox and click Save.
The Active value will be updated to the new value. To share the Active value across different users, you need to publish it to a Global value.
Click the Publish icon, as highlighted in the following screenshot:
Click Save. The Global value will be updated to the new value.