This website contains links to software which is either no longer maintained or will be supported only until the end of 2019 (CKFinder 2). For the latest documentation about current CKSource projects, including software like CKEditor 4/CKEditor 5, CKFinder 3, Cloud Services, Letters, Accessibility Checker, please visit the new documentation website.
If you look for an information about very old versions of CKEditor, FCKeditor and CKFinder check also the CKEditor forum, which was closed in 2015. If not, please head to StackOverflow for support.
The biggest surprise I've gotten from CKEditor is that it's not used in its own wiki!
I thought that since the old product, FCKeditor, has been adapted for use with MediaWiki that CKEditor would be, too. Apparently, that's not so! If it is, it's not enabled for editing talk pages and I can't find an option in my preferences to enable it.