Board Thread:Support Requests - Community Management/@comment-2038026-20170406201445/@comment-168424-20170407181454

Buckimion wrote: I believe if you select the "Admin" tools in the taskbar at the bottom of the page (assuming you have admin rights), at the top of the admin dashboard is an icon for "Wiki Features." Select that and about halfway down the page should be a way to toggle making users sign into accounts.

Help:Wiki Features

The specific part:

To prevent anons from editing, toggle it to Enabled.