How do I admin my server its a multiplay server thanks

I cant figure out how to be the admin on my server and do air drops etc if anyone could point me in the right direction id be grateful thanks

Nothing happens when I try these commands surely i need to login as an admin first but there is no option at all!

when you got your server you should have a rcon password,
logon to your server press f1 then type rcon.login password then you can toy with the other stuff