Please visit the site, ask your questions, and answer other questions. Some points to note from experience with Mathoverflow:
- If you're so inclined, please participate in the meta site as well. That's the place for discussions about the site itself, and is a good place to get involved and help shape the community.
- Please vote liberally and often. Especially in the beginning, voting questions and answers up when appropriate helps encourage others to stick around and participate more. If a question seems interesting enough to read, it deserves an upvote !