How to change index page title in phpbb -phpbb forum

When  you are making a forum in phpbb the title of the main page (index page) will be like  "Your forum name Index Page".
When I made a phpbb site this was one of the problems that i faced . But as usual i googled for a solution and finally I got the  solution. It was really simple

Step 1 

Open  the file language/en/common.php using a file manager.

Step 2

In that file find the code 

'INDEX'                  => 'Index page',

Just change 'Index page' to  whatever you want , like the name of your forum or anything else.

Step 3

Now you need to save the file.

That's all now you will have your site title changed.