Getting started with permissions:

• http://www.mediawiki.org/wiki/Help:Sysops_and_permissions
• Sysops can protect and unprotect pages http://www.mediawiki.org/wiki/Help:Protected_pages
• http://www.mediawiki.org/wiki/Help:Assigning_permissions
• List of sysops
• To be able to change user rights, you need to be a bureaucrat, see list of bureaucrats. If you are a bureaucrat, you can change permissions for users here Special:UserRights

A locked page