Board Thread:Support Requests - Getting Started/@comment-44889006-20200119065238/@comment-9605025-20200120021129

If you need to find the admins on a particular wiki, you can go to "Special:ListUsers/sysop" on that wiki. For instance, here is what you get when you do it here on Community Central.

As for the image, I would guess they pulled it straight from the mod files. But that is just a guess. Even if my guess is correct, I don't know how to do that for Minecraft so asking those admins would definitely be the way to go.