Board Thread:Support Requests - Community Management/@comment-3319977-20151102083312

One of my wikis has been vandalised quite a bit of late by unregistered users. One of them appears to pretend to be an admin. So I have an urge to block unregistered users from editing my wiki in one go, instead of blocking individual pages, but I can't seem to find the way in my settings. Can you show me how? 