Why don't I have access to UE4 C++ source code via GitHub?

How to fix it? Please help!

Go to Epic Games, sign in, then click on “Account” on the right and be sure the GitHub field is showing your username. If not, update and save.

Account:

http://puu.sh/8WtWf.png

GitHub field:

http://puu.sh/8WtYb.png