Board Thread:Support Requests - Getting Technical/@comment-33254236-20171113024747

I saw on the Help an example of this with that screenshot showing that the Harry Potter Wiki says "You have an owl." instead of the standard "You have a new notification."

I've looked for a few days now on looking on how to do this with no luck. I'm trying to change the new notif message on the Steel Diver Wiki to "You have an incoming transmission."

How do I do this? I've scoured the Special:AllMessages with no luck. PS, I do have Bureaucrat and Admin status there.  