Can't edit the name for for vB 4.x?

Hi guys,

For some reason when I try to install vBulletin 4, it's not letting me edit the file and renaming it to config.php

....because it shows up as "config.php" before I did anything....For file type, it still says "NEW file". What do I do to fix this? I can't upload anything until this is done. I'm able to edit the actual document. Just not the actual title to take out the "new".

Poster :