A LJ Question

I am confused what's new I hear you all say

As most of you know I have two journals here on LJ, my own one and my fic one. When some answers a post I make on my own I get notification but I cannot remember what I did or where I go in my options to do this so that I can get notifications if someone replies in my fic journal.

Could some kind person please point me in the right direction so I can do this.

Thank you