User blog:Sprinklemist/Help Regarding a User Unable to Log In

A user that frequents the wiki I'm an admin at (Total Drama Island Fanfiction wikia) had requested that his account name be changed. It happened, he went from User:Radicalm18 to User:Radical M. The issue is that he has been blocked as Radical M, and I've been unable to unblock him, though I tried a couple of methods. Any help would be greatly appreciated.