How would they get my password?
Probably or more like certainly from one of the forums.
The database either got hacked or the owner decided to sell it, or....
I was hoping since I have their BTC number, tho I left the last 4 characters off for the purpose of posting, that it would be possible to find this person.
I assume you're new to bitcoin

That's a payment address, you can't link a real-life person with that address unless he makes a mistake by posting it somewhere.
The only way to trace him is by tracing the funds and hoping he does deposit them on an exchange where again he will hopefully use his real name and identity.
Chances for that? Close to zero.
But if someone here wants to play the detective is better you let us know the whole address...
There is no contact info on the Bitcoin site, so I registered for this forum.
Bitcoin is a decentralized currency, there is no contact, there is no support.
My advice is to change that password you have used in multiple places to a new one or even better make a distinct password for each forum/email/service. This way if shit happens again not only you will be safe and only one account will be compromised but you will also know how he got that pass.