If you can't remember your password don't worry - you can reset it here. Just enter your email address in the box and click 'send me reset password instructions' and then keen an eye on your inbox. Sometimes these messages can sneak into spam folders, so if you can't find the email make sure you check there too.
Please note that due to security reasons the link within the email only works for the first time you click it. So if you don't complete the reset password steps straight after clicking on the link, you will need trigger another password reset email (see above).