Go to"Data"in app＞"KONAMI ID/Card Game ID"＞"Link to Konami ID" or "Register new Konami ID" and you will be able to link data.
Be careful when selecting "Link KONAMI ID"
If you have already have a KONAMI ID and logged-in, the linking process will be completed but if the Card Game ID is not registered to that KONAMI ID, then the gengerated Card Game ID will be automatically registered when you install the Yu-Gi-Oh! NEURON app.
Be careful when selecting "Register new Konami ID"
If you link from here, the automatically generated Card Game ID will be registered to Yu-Gi-Oh! NEURON.
※If you own an actual Card Game ID that is not registered in your KONAMI ID and you would like to display that CARD GAME ID, create an Card Game ID on MyKONAMI or KONAMI Card Game Network first, and then link the data from "Link to Konami ID"