You mean you don't know where?
If you have the steam version you should look for the game folder like so:
C:\Program Files (x86)\Steam\steamapps\common\Fear & Hunger 2 Termina\www
The itch version should be more simple since you can decide where the game gets downloaded.
If that's not what you meant then you should check the TY_ModLoader.js file which contains further instructions.
You can open the TY_ModLoader.js file in notepad to see its contents.
Let me know if you need further help!