You can have your own user page; it is all about you!
The two easiest ways to interact with other users are to join the forums or leave messages on users' talk pages. Remember to sign all of your posts, so we can quickly tell who left the message.
(Hint: Use four tildes (~~~~). This will automatically produce your username and date. You can also use the 'signature' button in the edit toolbar.)
You can include userboxes on your user page to express yourself. Your page can contain: