How can I change my User name?

I have successfully changed my name on Epic account but on forums i am unable to change it the preferences on the forums only allow to change profile image even that only from the pre selected ones but user name is greyed out.

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I need help with this also. My user name at Epic Games has been changed to OTHorizon, yet in this forum, my user name still shows the original name Fantam Mayfly. I would like these to match with Epic.
How do I accomplish this or can staff here fix it for me?