WebAsyst-ShopScript Ajenti integration

I'm pretty novice, but stuck in the implementation of the webasyst website.

My server on Centos 6

I was trying to insert this code (https://developers.webasyst.com/tips/nginx-fastcgi/) into Websites > Manager > Advanced Tab > Custom configuration

But it doesn't help me.

It seems to me that the main problem is just that. I have to make it clear to Nginx how webasyst structure looks like but i can't.