How can I change the directory index of my dedicated server ?

Solution :

To change the directory index [ .html, .php , etc ] of the dedicated server , login to the WHM and go to the path,

Home » Service Configuration » Apache Configuration » DirectoryIndex Priority

here you can choose the directory index and click move UP and move Down as per your requirement you can set the order.

In this same option you can able to add and remvoe the directory index.