@vkschhn95 the .env file is located in /opt/bitnami/apps/dreamfactory/htdocs directory.
If you've just logged in to your server you can navigate here by simply typing:
The .env file begins with a . so it is likely hidden, to show hidden files type:
You should see the .env file listed. If you don't see the .env file then you've got larger problems and your Dreamfactory is an anomaly because it can run without any environment settings.