Fill in your email address and password, and click "Sign In". If you keep the "Remember me on this computer" checked, the next time you return, your email address will be filled in for you. If you chose to enter a password in Preferences , the "Fill Password" button will be enabled, and you can just click it once to fill in your password, and log you in.

If you don't yet have a Google Base account, click "Create an account now".