IP Tracing

Ok, I know a person who helps run a forum, and is somehow able to ***** down almost ALL of your information, somehow starting with your IP address, and moving along down the line, through a chain of searches and queries. I want to know, how can someone find out your Home address and phone number and personal information, if you are on a proxy, and what possible ways can you prevent this. I will try to sign up here in the meantime.

what server or forum is this? coz i would like for them to find my home address coz im lost.