Thread:Project:Support desk/Can I make the created NameSpace as default NameSpace/reply (6)

Ciencia gave you a good solution. Point the main page to something else.

Also, change

$wgNamespacePermissionLockdown[ NS_MAIN ]['*'] = array('TestGroup');

to

$wgNamespacePermissionLockdown[ NS_MAIN ]['edit'] = array('TestGroup');