Board Thread:Support Requests - Getting Technical/@comment-26854335-20151222200215/@comment-1757994-20151223024335

If you mean site JS (MediaWiki:*.js files), you have ContentReview installed, so you should be able to edit.

If you mean personal JS (common.js, wikia.js, and monobook.ms), there's a preference you have to set.

Otherwise, provide more details of what it is you think you cannot edit.