This guide will tell you how to add an Administrator to your server.
• Find your SteamID64 either from these links:
https://steamid.io/
https://store.steampowered.com/account/
• Click "Configuration Files"
• Click "Text-Editor" next to adminlist.txt
• Add SteamID64, if you are adding multiple, each one goes on a new line, for example:
76561198023737807
76561194023457802
• Save & Exit the file in the top left and Restart your server.
Note:
To become an administrator, you had to enable the console in the options menu first in the key mapping.
Press the "~" button and authenticate it using the adminauth console command.
Once an administrator you can use several administrative commands like "banuser, bancharacter, banned, unban and kick".