[doutzen]

The BB pin is your "screenname" much like you would use AOL Instant Messenger.

BB Messenger is a form of IM that can only be done by blackberry users - and more specifically, users that you have identified as your "friend" by adding their pin.

To use BB Messenger, make sure you have it included in your service plan. If not, each IM will count as a text, and trust me, it will add up.

EDIT: Oops! Forgot to add how to use pins. Let's say you and I went to be BBM friends. I would...
1. Create a new text to you and type in "mypin" and hit SPACEBAR. Then hit send.
2. You would receive my pin code in that text instead of seeing "mypin." You then copy paste this code into my file in your address book. Scroll to the bottom of someone's entry and paste it where it says "PIN:"
3. Open BBM. Select "Add a Contact."
4. After selecting me as your friend, it'll send a verification message to me and until I confirm, I'll be listed in your BBM buddy list as "Pending." Once I accept, you're good to go!