The nickname feature is only available for servers. You can customize your name differently in each server that you are in. Some servers may have disabled the permission for changing nicknames. You won’t be able to change your nickname without permission from the server’s administrators.

Admins of the discord server can also change the nickname for other users on that server. Follow the below steps to check different methods for changing nicknames in discord servers:
- Open the Discord application.
- Select the Server from the left pane where you want to change the nickname. Click on the server’s name and choose the Change Nickname option in the context menu.
Changing nickname in server’s context menu - Now type a new nickname for yourself and click the Save button to apply it.
Changing nickname - You can also change your nickname by using a command in the message area. Type the following command, type your new nickname, and press Enter key to apply.
/nick Appuals
The nickname and the username on discord are two different names. Usernames work a bit differently than the nicknames in discord. Your friend list will be able to see the username in DMs and friend lists. Unlike the nickname, you cannot have different usernames for different servers.