Board Thread:Support Requests - Getting Technical/@comment-1020939-20140207075121/@comment-1277243-20140208161836

I believe it is installed by default; in any case, it is installed on your wiki. Try removing the stuff in <> tags; I don't believe they work on Wikia's version (or at least they didn't a couple of years ago).

Also, it doesn't work "instantly." It can take up to 20 minutes for it to take effect. It won't stop users from editing existing pages, and admins on the wiki can bypass it at any time, which makes it slightly harder to test.

If you need something that will work "instantly" and on existing pages, look into having AbuseFilter installed.