User blog comment:Dopp/New Profile Design Now Live Across All Wikis/@comment-3211073-20110822165806/@comment--20110822173107

Actually, to Delete or Protect, you need to be an admin (or higher) on your wiki.

Purge breaks the MediaWiki cache. It's a bit hard to explain if you haven't ever really looked at the MediaWiki software, but simply put, it gives you the most current version of the page - content, inclusion of messages, transclusion of templates, etc., etc.,.

Edit intro is used by some wikis to give you information you should see before you save an edit in the edit screen.