Welcome to StrafeRight.com!
Here's a thread that you can use to introduce yourself, just make a post saying hello, and what name you use in-game (in this case, what CS:S name do you normally play under). It's just a simple way to say hi to all the new members, and figure out who's who.
Also, please make sure to check out
So You Want To Join StrafeRight (sR) for all the information that you need to know about what StrafeRight is, and how to join.
One last thing, any new threads of the "Hi, Hello!" type will probably get merged into this one, but we'll leave a redirect, so don't get all paranoid about lost threads and whatnot, just look here at the most recent posts.