Go the the main menu of your client.
Select Settings.
Select Server Settings TAB on the far right.
In that section is a button "MAKE ME ADMIN", Click it.
It then asks you for the server admin password.
Enter password and you should get a little side popup that says access granted or similar.
Go back to the game hit CNTRL-SHIFT-C and the admin console should open for you.


Make sure you edit or add the line

AdminPassword=ClanHost2018

 in your server config. Click "Edit Config" button.