MediaWiki Tutorial - Change Page names

MediaWiki Documentation: Change Page Name

In order to change the name of a page, for example the name of the Main Page, you will first need to login as Administrator. You can do this by clicking on the 'create an account or login' link at the top left corner of your page (see screenshot).

Then you need to click on the move link at the top of the page. A new page will open that will give you the option to change the Title of the page.