1. Login to the WHM
2. At your left hand side Menu search for Easy Apache, Click on it
3. Keep the configuration as it is and go for Customize The Profile, click on it
4. You will see the current configuration, Click on Exhaustive Options button
5. You should see GD, Gzip, and other many options there. Enable them as per your requirements
6. Click on Save and Build.
It will take at least an hour to rebuild the apache and done.