Sharing issues...

I am sure this question has been asked before and I apologize however I cannot seem to get my router set up in such a way to allow my friends or myself to connect to my subsonic player from any other computer except my own. I can log in from my main machine just fine and I am loving every minute of having it. I set up accounts and everything but what address do i give my friends for them to go to? What kind of setting should I have in my router? I really need a good step by step...
Thank you,
Steve
Thank you,
Steve