How to install custom stories?

[DamnNoHtml]

So it works?

I can play it but it's glitching badly, it's like i don't have all the peices for it, and when i get to the end when you are suposed to get to the inner sanctum, it freezes...

You're most likely not using the updated (v1.2) version of Amnesia. The game has models that were introduced in that version, so if you don't have it, you'll see giant blank spaces.