Help with Changing Forum User Name

I need help with and changing my user/display name in the forums. My user name at Epic Games has been changed to OTHorizon, and at the top of this support page my updated name appears, yet in this forum, my user name still shows the original name Fantam Mayfly. I would like these to match with Epic Games.
How do I accomplish this or can staff here fix it for me?
I have already posted in Site Feedback in the forums, but I see someone asked this question back in May and it does not look like they got an answer, at least as a forum reply.