Creating an account on Twitch allows you to interact with broadcasters and the community via chat, follow your favorite broadcasters to receive alerts when they go live and of course, broadcast your own games to the Twitch community.
To sign up for an account, go to http://twitch.tv and select the "Sign Up" button on the top-right portion of the page.
This will open the Log In / Sign Up screen. To sign up for a new account on Twitch, fill out the form on the right-hand side, choosing a username, password, email and by telling us your date of birth.
Alternatively, you may also sign up for a Twitch account by using your Facebook account, achieved by selecting the "Connect with Facebook" button.