Tesla!D is your unique name used for TeslaPay services.
You are prompted to create a Tesla!D during the registration process. It should start with an exclamation mark (!), followed by the name/surname/username that you choose (at least 5 alphanumeric characters).
Your Tesla!D is used when you make Internal Payments with other registered TeslaPay users.
On the top right corner you will see your Name and Surname, just click on them, and you will find your Tesla!D: