Log in to the Kinetic Panel.
Stop the server.
Go to the file Manager.
Navgaite to Storage > starbound_server.config.
Locate "serverUsers"
Add in the brackets the part below
"<Username>": { "admin" : true, "password" : "<password>" }Change the password & username.
Save the file & start the server.
On joining the server, use the login created to log in as admin.
Starbound guide
How to become a admin on Starbound Server
This guide will cover how to create an admin user on your server and how to log in as that user.