Part 1:
1. Start your server and join your server.
2. Open the console of the Hurtworld Client (Press F1 to open up console) and type 'playerid'.
Remember your playerid (write it down as we will need it for part 2).
3. Stop your server.
Part 2:
1. Go to your Gamepanel.
2. Select "Configuration Files"
3. Select Configuration Editor next to autoexec.cfg file
4. Where it says "Administrator" type or paste in the playerid from step 1.
5. Save the file in the top left.
6. Start your server - you will now be an administrator.
For commands, you can use, please see: https://hurtworld.gamepedia.com/Console_Commands