I don't enter the Epic Games repository when I update my GitHub username

I created accounts in both Unreal Engine website and GitHub so then I could download the Unreal Engine 4. I should update my GitHub username so I could enter Epic Games organization on GitHub and access the files but when I update my username I still do not enter the organization. What can I do??

Please help,

You need to Enter the Username that is visible at the top right corner of Github, not your Email-Address or something like that.

If you did this correct, then you should get an invitation to the Epic Games Group on Github.