Default Image Request thread?

I've been trying to change the default character image for Randy Clayton. A couple months ago, pikahyper gave me instructions, and told me that if I couldn't make it work, I should make a request in "the default image request thread." I've finally gained enough points to edit wiki articles on the fly, so I though I'd give it another go. I can now add images to the character's gallery, but I can't change the default (or more specifically, add a default, as right now there's nothing). I searched for the default image request thread, but any forum search I try is returning a 500:Internal server error.

Can anyone point me to the right thread?