- Stop your server
- Go to http://steamid.co/ and find your Steam64ID
- Go to Configuration Files and edit the AllowedCheaterSteamIDs.txt file with Configuration Editor option, add your Steam64ID and save it
- Start your server
- Ingame Press TAB key to open console
- Type the admin command you want to execute, example: saveworld
This guide will help you on how to use admin commands.
You can find a complete list of admin commands in the official wiki here