Board Thread:Support Requests - Designing Your Wiki/@comment-34706699-20180216171256/@comment-24530269-20180216174014

Head to your wiki and enter "MediaWiki:User-identity-box-group-blocked" in the URL bar (not in the Wikia search bar. It won't find those pages until they've been edited at least once) behind the "/wiki/" component.

There, it'll display "Blocked" in a box. Hit Edit, change it to whatever you like as long as it's appropriate and hit Publish.

On the topic of editing existing user-tags, you can also enter the following instead of blocked:
 * founder
 * bureaucrat
 * sysop
 * content-moderator
 * chatmoderator
 * threadmoderator
 * rollback

Sysop = Admin.

Good luck with your wiki!