Log in to the Kinetic Panel.
Stop your server.
Go to the file manager on the Kinetic panel.
Open the data folder.
Open the serverconfig.json file.
Locate ServerDescription.
Enter your description. Make sure to enclose with double quotes.
Save and start your server.
Vintage Story guide
How to set the Server Description on your Vintage Story server
Setting the server description will allow you to give some info about your server.