Hi! You can change your server description in a few ways.
If you'd like to change the server description that shows up from within the Minehut lobby, you can make this change by editing the "Message of the Day" on the server dashboard. You can find the server dashboard here: https://minehut.com/dashboard/home (You will need click "Activate Server" and then "Manage Server")
If you'd like to change the server description that shows up in the multiplayer list on Minecraft, you can make this change by editing your "server.properties" file and changing the "motd=" line to a message of your choice. You can make this change by going to the File Manager tab on the server dashboard. Please be aware that you will need to restart your server after changing the message for it to take effect.