This bug reporting system.
You can change your name (the one not in parentheses) on this site by clicking on your name at the top->Profile->Manage->Edit Profile. This should link you directly to your profile edit page: https://developer.blender.org/people/editprofile/125688/ (which I obviously can't access, so I can only hope this link works.)
As for the name in the parentheses... I'm pretty sure you cannot change that unfortunately.