No worries! You can reset your password at the login page by clicking on the "Forgot your password?" link.
Once you click on the link, you'll be prompted to enter the e-mail address that your account is associated with.
You'll receive an e-mail shortly after with a temporary password to access your account. Once you have successfully logged into your account, be sure to change your password to something more secure by visiting your Account Settings.
(PS: If you don't see the e-mail right away, please check your spam or junk folder, just in case it might've been incorrectly filtered!)