Create a short cut to Hard Truck Apocalypse - Rise of Clans or just edit the one already on your desktop. Open the shortcut properties and add -console after the "Target:" line Ex:

This is how I installed mine, your game path will be different on how you
choose to install your game

Before:
"C:\Program Files\Buka\Hard Truck Apocalypse - Rise of Clans\htaroc.exe"

After
"C:\Program Files\Buka\Hard Truck Apocalypse - Rise of Clans\htaroc.exe" -console

when you start the game & play or load a game, using the shortcut you can
then type in various codes in the console by pressing "~", but you should
always pause game first by pressing "F8", because no likes to die while
trying to type in a code...hehe. For all those who don't know where the "~"
key is at, it's the key above the "Tab" key.

open console with the key "~" after hitting "F8" to pause: