Need help with admin rights

[Zederath]

So I created a server for me and my friends, and I need access to admin rights.

First of all, I created my server and started running it, and I used the command /adduser "abop" "password" and i'm not even sure what that does.

Next, I used the grantadmin "abop" and it says admin is granted. When I use commands, none of it work, how am I supposed to login as admin and where? I created a password as well.

 

 

 

Ps: When I use grantadmin do I refer to my in game name such as the one I log into the server with, or Something else??