Change Main Page Title - Mediawiki
From Help Wiki
You must have Admin access to modify the title of the Main Page.
- Go to Special Pages > System Messages
- Click on mainpage in the lefthand name column
- Edit the content of this page to reflect the new page name. This process creates a new page, you will need to copy any existing content from Main_Page to your new main page.
Alert: do not put special characters into the title! This may affect your ability to login to the site.