Follow these steps to change your Account Name:
On the top right corner of Stage Meta’s website, connect to your Account using the decentralized Wallet of choice.
In the same section, open “View Panel”.
In the bottom left corner of the options, next to your e-mail address, tap on the three dots, and then on "Profile".
In the “Account Name” field, select the pencil icon to edit.
Enter the new Account name in the prompt box.
Confirm the operation.