Several years ago I've created my account via facebook.
Later I've deleted my facebook account, then my username turned into a number. I can't change it via "edit profile" (there is no such field in a form) and enabling facebook data processing obviously doesn't fix problem because my facebook account is deleted.
Solved! Go to Solution.
What you sent me is a screenshot from your desktop device. You can only change your display name from a mobile device or tablet, like a mobile phone.
Once you do that let me know. Thanks!