Open Discord. Go to your desired server on the left sidebar where you want to change your nickname. In the message box, type in: /nick [preferred new nickname] and press Enter.

Discord, the gaming-voice-chat-turned-general-communication platform, gives you a few ways to customize names. You choose your username when you sign up, and you can change your server nickname on ...

Open Discord and log in to your account. Select the server you want to leave from the server list on the left. Right-click the same server icon. Select 'Leave Server' from the dropdown menu.