How to make myself Admin and execute commands Print

Method #2 - Whitelist: Make players admin permanently

1. Go to "Configuration Files" and open the text editor for "AllowedCheaterSteamIDs.txt"
2. Add the Steam64-ID for each player who is supposed to be admin, one ID per line
3. You can use http://steamid.co/ or the in-game command "cheat ListPlayers" to find the Steam64-ID
4. Save the file and don't forget to restart the server for the changes to take effect

How to authenticate as admin in-game
You don't have to authenticate with the admin password if you've added yourself successfully to the whitelist.

1. Open the console (default key TAB)
2. Enter the following without quotes: "enablecheats ServerAdminPassword"
3. You are now admin and ready to issue admin commands

Available commands and tools
A list of most console commands is available here: http://ark.gamepedia.com/Console_Commands

The ACM (Admin Command Menu) mod is an easy to use admin tool which allows you to open a GUI in-game where you can issue commands and spawn items/dinos. It also includes a livemap where you can see all players and teleport by clicking:
https://steamcommunity.com/sharedfiles/filedetails/?id=558079412