So how do i delete my server no delete button is there or anything close to it and if i downgrade the server runtime so it closes by itself will it cost money if i hv no money left in my account btw its minecraft not astroneer but the minecraft game is not popping up on label
Minecraft isn't showing up because it has its own category. i moved it to "general support" as it has nothing to do with a specific game.
You can simply leave your server as it is. Once the runtime is over it will go into standby and after 7 days it will be deleted. (shut down your server in the meantime if you don't want anyone to be able to play on it and disable all the automated tasks.)
You can however, if you really want, downgrade your server to the minimum. You will get smaller refund, but you also have to rent it for the minimum amount of time available (3 days).