I installed 1.26.2 version of Mediawiki, but my wikieditor doesn't look same as Wikipedia's. I checked the extensions (Extension:WikiEditor) which says that this extension is already bundled in version 1.18 above. Not sure how to resolve it. My website is 'www.safesearules.com'.
Topic on Extension talk:WikiEditor
You need to enable this when logged in. Under Preferences (top right hand side). And then in the Editing tab. It is called "Enable enhanced editing toolbar".