Im sorry but no one answered the question to this person so i will re-try because im curious how thing working here:
1) I download the file, Timo264's Shophack, and I place it in the KalOnline folder.
2) I open Kalonline (as administrator) in windowed-mode and login to the game.
3) I open the Shophack helper program (as administrator).
4) I go to the Merchant in Narootuh who sells fishtraps and open the shop window by talking to him.
5) I go back to the Shophack helper and click 'Generate'.
6) Then I add 4 item ID's of items the merchant in Narootoh sells. (Fishtrap, Small Med, Poison Pouch & Bamboo Keg) and press 'Generate'
7) I get the following Array of Bytes: 2F 00 EE 00 68 01 BD 01
8) I click on 'Add Adress' and put in the Array of Bytes I just found.
9) I filled the 3 Item ID boxes with the ID's of random item ID's I picked from the item ID list, in this case I chose for 3 pieces of G42 armor.
10) Change item.
And it's hwo it works? or i need additional knowledge or something?