Go to your "notifications" on the top right of any page on BL. Click on it. If you have a new PM (private message) it will show. If not, it will say no new messages. I think if you are a "greenlighter" you can only send one PM a day. Not sure, somebody pls verify this. I couldn't send more than one or two messages until I was a "bluelighter". You can also create an avatar and write something in your profile. I didn't figure that shit out until 2 or 3 days after I registered.
Also, something else I learned a few days after I registered. To stay up to date on threads you've started or posted in, you have to subscribe to the thread. I didn't know this at first and kept refreshing the thread I was in. You can have instant notifications sent to your email so you know when somebody responds or posts.
And I'm sure we have seen each other at some point. It's gon be hilarious when we meet and it's gon be like OMG I know you! Or, do you know so and so?? Ha.