How does Apple Cool Dog Music modify user nicknames?

How to change the user nickname is as follows:1; You log in first. After logging in successfully, your nickname will be displayed in the upper left corner of the player. 2. Click your nickname with the left mouse button, and a dialog box will appear-modify the nickname, and then a dialog box will appear. You can modify it according to the prompt, and then click Save to modify and confirm, and then ..