Board Thread:Support Requests - Community Management/@comment-27089775-20161113223032/@comment-28822533-20161114183225

Ideally you should have a community consensus already such as via forum or blog post with overall view of implementing abuse filter, then go to Special:Contact/general on your wiki.

However to just accomplish the task you describe, it may not be enabled for that reason - abuse filter is usually enabled on wikis with lots of daily edits, even more so on wikis with a history of vandalism.