Board Thread:Support Requests - Getting Technical/@comment-26852710-20151129185857/@comment-1757994-20151130000003

Not every wiki has the ContentReview extension installed.

If it's installed, there's a special page at Special:JSPages available. See Help:JavaScript review process for more info.

The extension is not installed on the OP's wiki, so he has to ask at Special:Contact, as KCCreations said, to get it installed.