Board Thread:Support Requests - Getting Technical/@comment-32821833-20180307065837/@comment-9605025-20180307072912

You don't activate an editor mode, it is selected based on your set preference, the content of the page, and the capabilities of your browser. Chances are something you did with the classic editor changed the content so as to trigger the classic editor by default. In that case, you can either use classic editor to undo it or (assuming not too many edits have been made since) you can use the "Undo" link next to the problem edit on the page's history page.

By the way, a individual site is called a wiki, wikia, or community; not a page. Pages are what comprise a single wiki and you cannot have elevated permissions for an individual page. The basic structure is that pages (there are various sub-types) form a wiki and wikis are hosted by Wikia servers. I hope this makes sense.