It's easy to change your server's display name in ServerPilot.
First, after signing in to ServerPilot, select the server you would like to rename from the Servers page.
Then, open your server's Settings tab.
Enter a new name for your server and click Rename.
Your server's new name will appear in your complete servers list in ServerPilot.
Remember, this will only change the display name of your server in ServerPilot; it will not change your server's internal hostname.