Board Thread:Support Requests - Getting Started/@comment-1738746-20151126211259/@comment-5811199-20151128030558

If your wiki is old (which seems to be the case, created in 2009), it may simply be that the older bureaucrats or admins had requested it to be switched off before, say for excessive vandalism. For example, this is the case for the MapleWiki, where anon edits were turned off and no longer can be turned on via Special:Features.

I think that simply asking Staff is sufficient.