How to change in Yu-Gi-Oh! NEURON:
"Data"＞"KONAMI ID/Card Game ID"＞ "Change Nickname
※You will need to register that Card Game ID to KONAMI ID and also data link in order to change the Nickname.
How to change in Konami Card Game Network:
Log-in with the KONAMI ID (which the Card Game ID is registered to) and go to My Page.
※Note: "Profile Name " registerd in KONAMI ID Personal Information and Nick Name for Card Game ID are different