Adding an Admin on your Rust server

You'll need to create a file called users.cfg the server does not automatically create one.
Upload this file directly to your server using SFTP to folder server/my_server_identity/cfg/
In the Command Center using your browser you can edit the file. Use the following on separated lines to set up either server owners or moderators. You will need the person's steamID64. Note that the steam ID does not have quotes, but the other 2 options do.

For the players you want to assign the owner admin role:
ownerid 64_bit_steam_id “optional_user_name” “optional_reason”
For the players you want to assign the moderator role:
moderatorid 64_bit_steam_id “optional_name” “optional_reason”

You will then need to restart your server in order for the changes to take effect.