If you forget your password and need to reset it, start by going to the log in page here:
At the top right of the screen press the password reset button.
A new window will open. Enter your email address, press submit, and an email will be sent to you.
This email contains a link you can click on to enter a new password. Make sure to check your spam folder if the email isn't showing up, and be patient. Sometimes it can take a while for the message to send. After you enter your new password you can go back to the log in page, and sign in using your new credentials.